api v2 environments - CRUD commands
Merge pull request #21 from komidore64/environment-crud

api v2 environments - CRUD commands
Add product command for CRUD in katello api v2

Conflicts:
	lib/hammer_cli_katello.rb
Update provider command description

Make it to have consistent case and punctuation with existing
hammer commands.
DRY up product command

- Uses Apipie::Command as base class instead
- Removes unnecessary resource method calls
Add set_sync_plan and remove_sync_plan for api v2

This adds ability to update sync plan hammer.