ASSOCIATE BOOKMARK WITH USER

Users who create a bookark need to be able to have that bookmark
	associted with them in order for future functionality (ie,
	likes) to properly work.

	* Create migration adding user_id to bookmark table with index
	* Create assocations in models
	* Update create method in bookmarks_controller
Merge pull request #8 from runyans7/associate-bookmarks-with-users

ASSOCIATE BOOKMARK WITH USER