Add package directory to sys.path in testing.  Should prevent errors in finding tests.regression and with testing the wrong instance of pyglet.
Add package directory to sys.path in testing.  Should prevent errors in
finding tests.regression and with testing the wrong instance of pyglet.

odyaka341/pyglet,cledio66/pyglet,arifgursel/pyglet,gdkar/pyglet,mpasternak/pyglet-fix-issue-518-522,shaileshgoogler/pyglet,google-code-export/pyglet,qbektrix/pyglet,kmonsoor/pyglet,kmonsoor/pyglet,qbektrix/pyglet,odyaka341/pyglet,xshotD/pyglet,kmonsoor/pyglet,cledio66/pyglet,google-code-export/pyglet,mpasternak/michaldtz-fix-552,mpasternak/pyglet-fix-issue-552,arifgursel/pyglet,google-code-export/pyglet,google-code-export/pyglet,mpasternak/pyglet-fix-issue-552,mpasternak/michaldtz-fix-552,cledio66/pyglet,Austin503/pyglet,Alwnikrotikz/pyglet,arifgursel/pyglet,mpasternak/pyglet-fix-issue-518-522,google-code-export/pyglet,gdkar/pyglet,gdkar/pyglet,qbektrix/pyglet,odyaka341/pyglet,Austin503/pyglet,cledio66/pyglet,Alwnikrotikz/pyglet,Alwnikrotikz/pyglet,shaileshgoogler/pyglet,mpasternak/michaldtz-fixes-518-522,xshotD/pyglet,kmonsoor/pyglet,mpasternak/michaldtz-fix-552,mpasternak/michaldtz-fixes-518-522,arifgursel/pyglet,xshotD/pyglet,mpasternak/pyglet-fix-issue-552,Alwnikrotikz/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-518-522,Austin503/pyglet,mpasternak/michaldtz-fixes-518-522,kmonsoor/pyglet,shaileshgoogler/pyglet,Alwnikrotikz/pyglet,cledio66/pyglet,mpasternak/michaldtz-fixes-518-522,qbektrix/pyglet,gdkar/pyglet,shaileshgoogler/pyglet,mpasternak/pyglet-fix-issue-518-522,arifgursel/pyglet,qbektrix/pyglet,odyaka341/pyglet,xshotD/pyglet,gdkar/pyglet,Austin503/pyglet,mpasternak/pyglet-fix-issue-552,shaileshgoogler/pyglet,xshotD/pyglet,odyaka341/pyglet,mpasternak/michaldtz-fix-552