add context handler for sentry dsn
add raven and some global variables to BB
add raven.js for development and config
add git commit to raven logger
bump selenium version for travis
fix minify issue with regex items
only load raven when dsn has been set - having it in debug isn't necessary
get sentry/raven settings from the secret dsn and strip out private key when making it available in the templates
Merge pull request #566 from onepercentclub/feature/enable-sentry

Add sentry for logging exceptions in Django and Ember