Additional pagination parameters support

Merge pull request #4 from socio-labs/feature/pagination_params

Made code refactor

Fix active record exists?

v.2.2.1

Update version 2.3.0

Serializer Class

Custom serializer for a response,
This improvement fixes using multiple serializers for one controller.

Extra paginate renderer

Seperate paginated renderer with non-paginated ones

Response structure changes

Pagination response keys became solid,
Removed pagination links from meta

Full URL is removed from pagination links.

The example is shown below

"meta": {
    "pagination": {
        "total_count": 33279,
        "total_page": 1110
    }
},
"links": {
    "current": "?page[number]=3",
    "first": "?page[number]=1",
    "prev": "?page[number]=2",
    "next": "?page[number]=4",
    "last": "?page[number]=1110"
}