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
refactored canvas
minor styling update
Merge branch 'master' of https://github.com/cicadas-2014/percolator into graph_view
Merge pull request #69 from kurokoda/master

Adding new dummy data
commit before merge
increased size, solution nodes now expand properly
Merge pull request #70 from mcclungt/graph_view

resized view and fixed solution nodes expanding