do not sign boo.lang
Specify fno-omit-frame-pointer on OSX to all for proper stacktrace output.
Add mono_backtrace_from_context to properly retrieve a backtrace when altstack is being used. OSX only at the moment.
Move variable declaration to beginning of scope.
Only walk the specified number of frames in mono_backtrace_from_context.
Revert "do not sign boo.lang"

This reverts commit 977ee357e907ca9f7fb5c11d58c96df89d72fe98.
Merge pull request #84 from Unity-Technologies/unity-4.3-staging

Unity 4.3 staging - Fix callstacks on OSX