add a safer html sanitizing, used clean_html in markdown rendering
Merge remote-tracking branch 'upstream/develop' into security-update
fixed bug with rendering code blocks
updated articles helper to fix problem with nil language, added test to support changes
Merge remote-tracking branch 'upstream/develop' into security-update

* upstream/develop:
  fix for coveralls?
  small updates to view spec and method
  Update README.md
  added specs to 'visitors/index' and scenario to 'features/event_countdown' to check for '-1h' when event is planned within 23h. Changed the 'distance_to' method in 'datetme_extension.rb'
Merge pull request #322 from yggie/security-update

Security Update