added new admin section + link to go back between admin section and front page

- clicking logo or "big hearts" title redirect to front page
- clicking "welcome... " redirect to admin section
- added new admin section, when user logs in, will be redirected to
this admin section.
- added sidebar to access the options
- added links to the different editing sections
- sections not yet customized
Merge branch 'activities-edit'

Conflicts:
	main.pyc
	models/organization.pyc
	templates/index.html