Initial script for testing all osb projs

Requires https://github.com/OpenSourceBrain/OSB_API/tree/master/python
More test all
Merge branch 'master' into testing_all

* master:
  removed obsolete omv_test command
  fixed silly mistake in single test runner
  Catching error if length of spike times in expected & actual data are different
Some more updates on test all script
Minor text tweak
Merge pull request #30 from borismarin/testing_all

Adding script for cloning all OSB projects with OMV-using .travis.yml & running all their tests locally
Merge branch 'master' of github.com:borismarin/osb-model-validation into backend_class
tentatively setting env vars / path on install (subproc will inherit)