Replaced BS2 with BS3 files
Removed the <link> to bootstrap-responsive and added bootstrap-theme instead.
base.html and admin index converted to BS3
app_index -> BS3
Fixed object tools navbar
change_list -> BS3
change_form -> BS3
change_form -> BS3
Delete confirmations -> BS3
Bits and pieces -> BS3
Login & logout forms
Password change -> BS3
pagination -> BS3
Password reset -> BS3
Updated class names in JS & CSS