dummy fix for invalid addresses
log exception
course emailer cleanups
Upgraded rails to 3.2.x, updated gems.
Updated ffi version.

Seems like they removed 1.9.1 from RubyGems entirely.
Something must have been very wrong.

Fixes #135
The ffi gem was pulled yet again.
Updated ext/tmc-sandbox.
Optimized StudentEventsController.

Gained ~50% speed according to the included benchmark.
Also removed unnecessary access checks, which might yield
significant gains when locked exercises are involved.
Merge pull request #137 from testmycode/optimized-student-events-controller

Optimized StudentEventsController.
Perf test for large student events.
introduce student_events_recorder rack app
more logic, less tests