Major cleanup of validator repo. Tweaks to scripts to make them work with new folder structure
Added README, some tweaks to imports
Edits to get all the scripts to work once installed
Added XmlValidatioError to module import
Removed png generation from html callbacks
Fixed bug in html output that removed <> from code blocks. Removed dependency on siyavula.transforms
Added ExerciseValidator class.
Added egg directory to gitignore.
Merge pull request #9 from Siyavula/develop

Merge Develop into Master