added a select box for giftee name
Set up gifter as user

* added login, sinup and logout links
* validation for uniqueness and presence
	for gifter name
* created a current_user global variable in app.
	controller
* if session? before rendering certain pages,
	 redirect to login if false
* can’t edit another gifted or destroy
Merge pull request #2 from wb9753/create_user_master

 Set up gifter as user