Closes #113 - adding remember_me services.  The user table already had t...

...he required fields, so I didn't add a DB migration.

Enabled remember_me in devise config
Fixed selectors for the login test to use the element ID instead of the text.
Added show_me_the_cookies gem for cookie manipulation
Added new tests to cover positive and negative case
Added new support file for init'ting the new gem.