Use the latest versions of the eggs
Tests against multiple versions of Django
Install six for Django 1.4 testing
Python version without quotes
Remove useless indent option for evolution
Use default six version instead of the packaged version in django
Merge branch 'feature/travis-django-matrix' into develop
Move matrix part after the env part
Rename cover part to test-and-cover
Remove pdbpp because is not really needed, except for comfort
Add support to extend the first app's template (empty namespace)

Fixes https://github.com/Fantomas42/django-app-namespace-template-loader/issues/1
Clarify existing test_extend_and_override test

I found it confusing that the used `block` was not used/checked via the
mark, and therefore added explicit asserts for it.
PEP8
Fix import for Python < 2.7 with Django's SortedDict
Only use SortedDict bundled with Django
Set maxDiff to None globally
Reorder mark_title tests
Testing the behavior of load_template_source methode with an empty namespace
Cover the code at 100%
Except assertHTMLEqual under Python > 2.7.3 and Django 1.4