Let TextMate::Executor add warning/error marks in gutter

Requires TextMate 2.0-alpha.9575
Pass error/warning text to TextMate when setting gutter mark

Requires TextMate 2.0-beta.3
Remove event library

This was originally intended for optional Growl support but was never used outside of the Subversion bundle. That usage has been removed so thus the library as well.
Merge remote-tracking branch 'textmate/master'