Changed send mail message to return on callback
Updated lib/core
Updated lib/core
stylesheet update
Removed user and challenge functionality
Moved to lib/core
Added highscore collection
Renamed config variable SAMPLE_DATA to DATA_PATH
Removed old markup and added for new nav-pills header
Added test quiz for development
Fixed new error declaration with error code
Fixed highscores
core update
styles update
Updated lib/core
social share images
styles update
Updated lib/core
minor style fix. config update
Sound now has one segment and duration of sound