added progress on TheEyeTribe python interface

test files are in psychopy\iohub\devices\eyetracker\hw\theeyetribe\test

* Set TEST_WITH_DUMMY_SERVER = False to test with real eyetribe server.

* run the test:

python eyetribetest.py
Expand user_variables into individual columns of the session meta data
ENH: Updated eyetribe eye tracker interface

* based on work Zaheer and I did today.
* NOT USABLE YET; but will only be another couple weeks before
integration with iohub is done and tested I would think.
Cool!
Merge branch 'dataview'