Fixed duplication and other issues in runtests.py
Created tox.ini and fixed travis.yml to use tox.
Fixed South migrations on Django 1.4
Removed some non-working test combinations.

Django 1.4 doesn't work on Python 3. The previous travis.yml implied the
combination was tested - it implied a matrix of Python 2.6, 2.7, 3.2, 3.4 on
Django 1.4, 1.5, 1.6.  In fact, due to installing all Django versions in
order, it tested all the Python versions on Django 1.6 only.
Replaced testing on Python 3.2 with 3.3, because 3.2 is no longer supported by South
Added missing migration.

Not sure why this was needed, but makemigrations insists on adding it (as
does running makemigrations on the dependant wiki_notifications app).
Added tests for Django 1.7
Fixed position of 'coding' lines
Merge pull request #12 from spookylukey/fix_travis_and_tests

Fix travis and tests