[popen] created a Sensu IO class for wrapping popen, check timeout
[popen] ruby version sensitive tests
[popen] use echo -n to not produce \n in test output
[popen] another ruby version sensitive test
[popen] no longer run into nil status
[popen] use process groups for checks, clean up zombies
[popen] cleaned up garbage
[popen] put timeout result in zombie cleanup rescue
[popen] windows process group support, ruby >= 1.9.3
[popen] updated ruby version sensitive tests
[popen] restored testing commands, original behaviour
[popen] platform specific shell
[popen] define shell in platform case first
[popen] concatenate instead of splat for popen shell
[popen] move error handling out of method
[popen] use if over unless if easier on the eyes
Merge pull request #424 from portertech/popen

Sensu IO class for wrapping popen, added support for check timeout