Bump Django to v1.4.4
Bumping Django version in .travis.yml
Release armstrong.core.arm_sections v1.5.5
Merge v1.5.5
Bump Django to v1.4.5
Release armstrong.core.arm_sections v1.5.6
Merge v1.5.6
Package update to `django-mptt`. Resolve DeprecationWarning by explicitly defining a TreeManager.
Order tree nodes by `title` and also provide a default ordering for non-TreeManagers (like `objects`).
SectionManager orders the same as TreeManager
Remove default ordering. SectionManager provides the ordering we expect and this Meta block is a confusing alternative.
remove explicit Django `install_requires` in setup.py. remove deprecation warning in Django 1.5 for url imports.