Started clientside javascript for Follow module

Wrote jQuery calls for manipulating Follow button, based on whether the button is on the current user's own profile, and whether the current user is already following the person.
Merging new clientside JS follow file
Deleted unnecessary checkbox script
Initialized clientside follow file

Copied example chat-client.js from Lecture 22 example (jQuery ajax)
Merge pull request #43 from mrattner/master

Initialize clientside JS file for AJAX feature