created comment model and associations. Added helper method for last comment text
initial css for comment form
hover over post activates text input box
turn off focus textbox when exit hover
textbox hover now working for enter exit
replaced mouseover with mouseenter
removed shadow from input boxes on root
added show/hide functions for submit button visibility
added controller for comment creation
Merge branch 'master' of https://github.com/dp6ai/flapjack into comments