Merge pull request #4 from pbs/tox

Integrated Tox
Bumped version
Bump version as instructed by bamboo
Merge branch 'master' of ssh://github.com/pbs/cmsplugin-feed
LUN-1110 Use a string instead of json for src attribute of image element
LUN-1110 Add tests for processors. Make sure entries['image'] is a basestring.
Removed duplicated file
Rename a fixture to xml file
Don't process anything in case the feed is invalida (None)
LUN-1110 All tests are passing. Add a test for the case of invalid feed.
Stop using mirrors for pip as per PEP449
Merge pull request #5 from pbs/LUN-1110

LUN-1110 Images doesn't appear for feeds with itunnes namespace
Bump version as instructed by bamboo. Switch to increase the minor instead of patch
Fix unit tests adding a forgotten arg.
Add pyo files to gitignore list
(tox) Added more flags to tox.ini
(tox) Removed nose testenv from tox.ini