Started porting to use Express 3.x and improved grunt tasks generated by
yo express

For now, I'll stick with Express 3.x to learn it because I have 2 books
that use Express 3.x. I'll move on to Express 4.x later
Ported app.js to Express 3.x
Updated Gruntfile
Removed unneeded bin, Grunt now launches the app
Converted route logic to Express 3.x
Fixed stray bracket
Start the server in app.js because we don't have a script for that anymore
Added 4chanjs as a dependency
Started to move routing logic to app.js
Finalized backport to Express 3.x