Changes from Ismael's mail.

- Following PEP8
- Removed our personal logout and used contrib auth
- Moved some forms from models to forms
- Little details to simplify code reading
Documenting views.py
I haven't been documenting enough. That will change.
A bit more documentation and adding verbose names to the UserProfile model.
User profile is displaying age properly.
Changes to settings were due to a bug that turned out to be unrelated to the settings. No lasting changes there.
Created functions for the user's stats.
  - calculate the body mass index
  - calculate the daily requirement needs

Changes to views.py are incomplete.
The body stats are working properly. I only need to adjust the GUI to make it pretty.

IMPORTANT: Due to troubles I was unable to fix I had to remove django debug toolbar.

Changelog:
  - Made south work with the users app.
  - Added methods for calculating body stats to UserProfile
  - Created view for body stats
  - Removed django debug toolbar including it's urls
GUI changes to body stats.

Changelog:
  - Changes to the gui on the body stats page.
  - Width changd on the navbar. No longer fixed width.
Merge branch 'physical_profile'

Conflicts:
	c_nutra/templates/base.html