Merge pull request #53 from mcclungt/improvements

created improvement model and model spec
Cleaning up display of problem view
Merge branch 'master' of github.com:cicadas-2014/percolator
Merge pull request #54 from kurokoda/master

Cleanup of JS and CSS
commit before pull
Merge branch 'master' of https://github.com/cicadas-2014/percolator into improvements