add ability to pass extra parameters to bin/deploy.sh

[nathanielks]

This makes it simpler to modify the ansible-playbook command, especially in the instance of debugging via -vvv or limiting what hosts getting deployed to using --limit.

[swalkinshaw]

~/d/trellis ❯❯❯ ./bin/deploy.sh
Usage: deploy <environment> <site name>

<environment> is the environment to deploy to (staging, production, etc)
<site name> is the WordPress site to deploy (name defined in wordpress_sites)

Available environments:
development
production
staging

Examples:
  deploy staging example.com
  deploy production example.com

~/d/trellis ❯❯❯ gco extra-deploy-params
Switched to branch 'extra-deploy-params'
Your branch is up-to-date with 'origin/extra-deploy-params'.
~/d/trellis ❯❯❯ ./bin/deploy.sh
PLAY [Ensure necessary variables are defined] **********************************

TASK [Ensure environment is defined] *******************************************
skipping: [localhost]

PLAY RECAP *********************************************************************
localhost                  : ok=0    changed=0    unreachable=0    failed=0

[nathanielks]

@swalkinshaw updated 👍