osd_regression does not need GLEW on OSX
mention regression test executables in the readme
osd_regression: towards testing multiple backends; adding cmdline arg parsing
osd_regression: towards running all test cases per backend (checkBackend function)
osd_regression: implement raw CPU and CPU with GL VBO backing tests. Actually count test failures; they were not counted before ;)
Merge pull request #108 from aras-p/regression_tests

Improvements to osd_regression