Add Sessions Controller and start of authentication tests
Add sessions routes
Add empty actions to sessions controlelr
Start of sign in page
Add tests for sign in failure
Initial sign in form
Tests for in/valid signin
Start of sessions create action
Add home link
Add test to make sure alert goes away after changing pages
Use flash.now instead of flash
Add test for remember_token
Start of signin process
Make sure we include sessions helper
Add remember token to users
User create remember token functions
Add sign_in method
Add methods for dealing with current_user
Add method for signed in status
Update navigation links for signed in user