Fix and run tests on python 2.7 / 3.4

* Test 3.4 on travisci
* Bump django-jsonview to latest
* Modify tests based on python 2 / 3
* Update tox envlist

Squashed commit of the following:

commit 5721a95c6872f67aa121ba6fd289a7d72d008dd1
Author: Michael Warkentin <mwarkentin@gmail.com>
Date:   Fri Sep 5 11:59:33 2014 -0400

    Update python support to only 2.7 and 3.4

commit 9d371b40024126d9467329610791a5b1da7992fb
Author: Michael Warkentin <mwarkentin@gmail.com>
Date:   Fri Sep 5 11:53:17 2014 -0400

    Switch assert method for python 3

commit fa00a3c50800cbbd7a9f36aab2c185ffc1b13b34
Author: Michael Warkentin <mwarkentin@gmail.com>
Date:   Fri Sep 5 11:18:38 2014 -0400

    Change json decoding based on python version

commit 93824fd414525a505e94735278db1c0042e31c33
Author: Michael Warkentin <mwarkentin@gmail.com>
Date:   Fri Sep 5 10:56:57 2014 -0400

    PEP8: Remove unused import

commit a8db725131645fb98dc250448e8f821e45553e11
Author: Michael Warkentin <mwarkentin@gmail.com>
Date:   Fri Sep 5 10:56:31 2014 -0400

    Bump django-jsonview to 0.4.3

commit 961be5d101b155d4dd797dcf24bd958d64f0edb0
Author: Michael Warkentin <mwarkentin@gmail.com>
Date:   Thu Sep 4 22:49:27 2014 -0400

    Add python 2.6 and 3.4 to travis tests
Bump to 0.2.2