added environment_products relation.
fixed code review comment
os - repo many to many
orchestration for pulp
Merge branch 'env' into repo

Conflicts:
	app/models/content/repository.rb
	app/views/content/repositories/_form.html.erb
os product relation has many through
cleanup
adding host and hostgroup product relations
parse pulp error message
fixed PR comments
added host product selection ui
Merge pull request #6 from abenari/repo

basic pulp integration