Clarify the setup of authenticated VCS
Fix doc reference

Conflicts:
	docs/releases/2.5.1-rc1.rst
Automate PO file updateing

make get-translations - gets translations from pootle.lm.org
make linguas - generates the LINGUAS file

The automation reduces errors in retreival as well as in building the
LINGUAS file.
Update translations before 2.5.1 final
Update copyrights to 2014
Update requirements

- Move to latest Translate Toolkit
- Refresh minimum and current at release requirements files.
Add 2.5.1 release notes

Essentially a copy of 2.5.1-rc1
Update versions to 2.5.1 final
Add note about not supporting Django 1.5 and 1.6
Typo