add polymorphic comment table
add comments view folder
create comments migration
add comment spec files
initialize (@improvement -> Improvement.new) so the improvements form that renders from problem show can hold an improvement object in the form_for
create methods to access commentables in improvement/problem/solution
add form partial for improvements
update routes to accomodate comments
log key parameters
add ajax method receivers for category specific comments
git glitch on spacing
add comment schema
git glitch on spacing
Merge pull request #70 from mcclungt/graph_view

resized view and fixed solution nodes expanding
-implement dynamic comment boxing functionality (based on comment category)
-ready except for ajax
add event listeners for comment append action
add get and post for comments(ajax)
add username column to comments table
add ajax functionality for getting comments
add ajax receiving functionality for the get S/P/I comment methods