moving find all catalog children method to model
Adding files retrive api first version
Merge remote-tracking branch 'upstream/master'

Conflicts:
	app/models/catalog.rb
Adding search for file_ids api
Merge remote-tracking branch 'upstream/master'

Conflicts:
	app/models/catalog.rb
	app/models/search.rb
	config/routes.rb
fixing conflict resolution error
Fixing code review comments
removing unneeded
Merge pull request #37 from amikhile/master

adding file_ids api