Fixed unit tests to run on the newest version of workbench

[marjev]

@martynjames

This should fix issue SOL-299.

[martynjames]

Line is too long, may have to split it up a little more (123 chars)

[martynjames]

The aim here is to have the tests working in their own environment, so we cannot depend upon stuff already present in edx-platform dependencies. The requirements.txt file may need to be updated, and it's possible that other dependencies still need to be added to get the tests up and running.

Try running it in a new mkvirtualenv, with pip install -r requirements.txt - this will need to run. I just built a clean one 'cos I might have screwed up the previous run

[martynjames]

Sweet! - we need a few things added in here:
Calling pep8 checks
Calling pylint checks
After running tests, we need to run the coverage report.

Once you've got that running we may need to increase the coverage if we are missing a lot ;-)

Please take a look at https://github.com/edx/edx-milestones/blob/master/.travis.yml for a good example