Patch: Sentry.io

Added support for Sentry, uses official Raven library, should work.

Many files are patched, rebased on the latest master. Ready to merge I think.

• Modules patched to send some errors
• Snowball patched to make it more nice
• This change also makes all global variables starting with $
• Snowball is now global object, and can be accessed with $snowball

Seems good.

I actually thinking about more nicer system of global usage. Aka it should not be used at all. May be... pass it to module constructor? dk dk

merged