Add markdown preview to nit edit.
Merge pull request #2012 from apothem/master

Add markdown preview to nit edit.
Add escaping for strings in editing comment. Fixes #2014
Setup compass with bootstrap sass
Remove not needed configuration

(everything is in config.rb)
Integrate frontend css to sass stack
Migrate site to bootstrap 3
Update README to explain scss setup
Commit CSS -- hacky workaround

This is just until I can figure out how to get the precompile stuff working on heroku
Merge pull request #2007 from jalyna/switch-to-bootstrap3
Remove conflict markers from edit page
Fix design glitches on mobile
Merge pull request #2020 from jalyna/fix-mobile-glitches

Fix design glitches on mobile
Clean up about page
End list of completed exercises with a period instead of a comma
Merge pull request #2025 from drueck/completed-exercises

End list of completed exercises with a period instead of a comma
Move language/problem notes into x-api guide
bump ruby version in .ruby-version.example
Merge pull request #2031 from Jberczel/bump-ruby-ver

bump ruby version in .ruby-version.example
Fixing 2 links on the homepage which have invalid html