Docs: Add URL patterns and extend template naming on styleguide
Drop support for Python 2.5

The Travis configuration exclude matrix is kept for further reference.

Fixes bug 3086
Fixes bug 3087
Travis configuration file cleanup
Nit: removed extra whitespace
Docs: Add update requirements minimum versions step to releasing
Cleanups
Partial revert of previous commit to remove introduced bug
Cleanup: removed check specific to Django 1.3
Tagging: Show ordered tag lists
Tagging: Rename URL pattern parameter for better understanding
Cleanup: Move custom LDAP auth backend to pootle.core