Fix #41
Fixes #44 PhoneNumberPrefixWidget: 'PhoneNumber' object has no attribute 'split'
Avoid Django to raise warnings for test runners.
Drop support for python 2.6 and django 1.4
Settings TEST_RUNNER makes tests fail on django 1.5
Add coveralls support.
Correct typo in test command
Add travis/coveralls badges
PEP8 (excluding unused imports)
Removed unused imports.
Merge remote-tracking branch 'phwag/develop' into develop

Conflicts:
	phonenumber_field/widgets.py
Merge remote-tracking branch 'jbowen/develop' into develop
Merge pull request #51 from GaretJax/develop

Drop Py 2.6/Django 1.4, PEP8 fixes and Coveralls support.