Add a scw _cs helper

[moul]

➜  ~  curl -X GET -H "X-Auth-Token: 00000000-0000-1000-0000-000000000000" -H "Content-Type: application/json" https://api.scaleway.com/containers | jq .
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2028  100  2028    0     0   2828      0 --:--:-- --:--:-- --:--:--  2832

{
  "containers": [
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "armbuild",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "armhf-docker-registry",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "manfred",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "moul",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "rescue-images",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "root",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "test-bootscripts",
      "size": "0"
    },
    {
      "organization": {
        "id": "11111111-1111-1111-1111-111111111111"
      },
      "name": "test-images",
      "size": "0"
    },
  ]
}

---

➜  ~  curl -X GET -H "X-Auth-Token: 00000000-0000-1000-0000-000000000000" -H "Content-Type: application/json" https://api.scaleway.com/containers/moul | jq .
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  5456  100  5456    0     0    756      0  0:00:07  0:00:07 --:--:--  1367

{
  "container": [
    {
      "last_modified": "2015-01-16T11:46:20+00:00",
      "name": "100Mo.dat",
      "size": "100000000"
    },
    {
      "last_modified": "2015-03-11T11:56:33+00:00",
      "name": "101Mo.dat",
      "size": "100000000"
    },
    {
      "last_modified": "2015-05-28T16:33:56+00:00",
      "name": "3.19.8-std/build.txt",
      "size": "167480"
    },
    {
      "last_modified": "2015-05-28T16:33:55+00:00",
      "name": "3.19.8-std/config-3.19.8+",
      "size": "93989"
    },
    {
      "last_modified": "2015-05-28T16:33:54+00:00",
      "name": "3.19.8-std/include.tar.gz",
      "size": "988988"
    },
    {
      "last_modified": "2015-05-28T16:33:51+00:00",
      "name": "3.19.8-std/lib.tar.gz",
      "size": "108588871"
    },
    {
      "last_modified": "2015-05-28T16:33:55+00:00",
      "name": "3.19.8-std/vmlinuz-3.19.8+",
      "size": "3223768"
    },
    {
      "last_modified": "2015-05-28T16:11:12+00:00",
      "name": "4.0.2-std/build.txt",
      "size": "153937"
    },
    {
      "last_modified": "2015-05-28T16:11:08+00:00",
      "name": "4.0.2-std/config-4.0.2+",
      "size": "94695"
    },
    {
      "last_modified": "2015-05-28T16:11:09+00:00",
      "name": "4.0.2-std/config-4.0.2+.old",
      "size": "94695"
    },
    {
      "last_modified": "2015-05-28T16:11:04+00:00",
      "name": "4.0.2-std/include.tar.gz",
      "size": "993954"
    },
    {
      "last_modified": "2015-05-28T16:11:01+00:00",
      "name": "4.0.2-std/lib.tar.gz",
      "size": "110420200"
    },
    {
      "last_modified": "2015-05-28T16:11:05+00:00",
      "name": "4.0.2-std/uImage",
      "size": "3224928"
    },
    {
      "last_modified": "2015-05-28T16:11:06+00:00",
      "name": "4.0.2-std/uImage-4.0.2+",
      "size": "3224928"
    },
    {
      "last_modified": "2015-05-28T16:11:09+00:00",
      "name": "4.0.2-std/vmlinuz-4.0.2+",
      "size": "3224928"
    },
    {
      "last_modified": "2015-05-28T16:11:11+00:00",
      "name": "4.0.2-std/vmlinuz-4.0.2+.old",
      "size": "3224928"
    },
    {
      "last_modified": "2015-05-28T16:11:06+00:00",
      "name": "4.0.2-std/zImage",
      "size": "3224864"
    },
    {
      "last_modified": "2015-05-28T16:11:07+00:00",
      "name": "4.0.2-std/zImage-4.0.2+",
      "size": "3224864"
    },
    {
      "last_modified": "2015-07-01T14:00:18+00:00",
      "name": "4.1-std/uImage",
      "size": "3282504"
    },
    {
      "last_modified": "2015-05-08T15:39:31+00:00",
      "name": "bitrig-bsd-dtb",
      "size": "15930"
    },
    {
      "last_modified": "2015-05-12T13:08:53+00:00",
      "name": "bitrig-bsd-uImage",
      "size": "26460224"
    },
    {
      "last_modified": "2015-09-04T13:33:20+00:00",
      "name": "dev-dtb",
      "size": "16674"
    },
    {
      "last_modified": "2015-09-04T14:42:37+00:00",
      "name": "dev-uImage",
      "size": "3339272"
    },
    {
      "last_modified": "2015-09-07T14:55:48+00:00",
      "name": "initrd-Linux-armv7l.gz",
      "size": "4147979"
    },
    {
      "last_modified": "2015-01-16T12:39:57+00:00",
      "name": "rootfs.tar",
      "size": "318197760"
    },
    {
      "last_modified": "2015-01-16T12:06:17+00:00",
      "name": "tmp/build/ocs-distrib-opensuse-13.2/rootfs.tar",
      "size": "318197760"
    },
    {
      "last_modified": "2015-05-19T09:50:14+00:00",
      "name": "uImage-xen-4.5-armhf",
      "size": "656284"
    },
    {
      "last_modified": "2015-06-16T16:57:14+00:00",
      "name": "uInitrd",
      "size": "7393702"
    },
    {
      "last_modified": "2015-09-07T14:55:47+00:00",
      "name": "uInitrd-Linux-armv7l",
      "size": "4148043"
    },
    {
      "last_modified": "2015-07-28T14:18:50+00:00",
      "name": "uInitrd-Openbsd-armv7",
      "size": "22232640"
    },
    {
      "last_modified": "2015-05-19T09:41:13+00:00",
      "name": "xen-4.5-armhf",
      "size": "656220"
    },
    {
      "last_modified": "2015-05-19T10:18:17+00:00",
      "name": "xen-dtb",
      "size": "16396"
    },
    {
      "last_modified": "2015-05-12T15:12:49+00:00",
      "name": "xen-uImage",
      "size": "3507776"
    },
    {
      "last_modified": "2015-05-19T09:42:18+00:00",
      "name": "xen-zImage",
      "size": "3497944"
    }
  ]
}