Make tests actually import staticfiles finders

staticfiles finders were not being loaded (and silenced by try/except)
since the settings are not yet configured at the point of import.
Actually look at ASSETS_DEBUG in the tests
Import multiprocessing to help with atexit errors

http://bugs.python.org/issue15881#msg170215
https://groups.google.com/forum/#!msg/nose-users/fnJ-kAUbYHQ/_UsLN786ygcJ
There is no self in assert_raises_regexp
Make sure template test uses some unicode