Remove wip on passing feature
Don't blow up on with stack overflow

Assumptions about backtrace formatting were causing the exception
recording code to raise its own exception, which is annoyingly difficult
to figure out. Anyway, when you have a SO, it doesn't necessarily
 follow the format of `$file:$line_num:in $meth`. So solution is to not
assume the last colon. This is a bit less strict than I'd like, but I
don't think it will actually matter for any real-world scenario.
Have cuke show that error comes from first line in backtrace, not first line in file
Bump version to 0.0.19