Ensure errors from build script are raised

The webassets script will return a numeric error value in certain
failure cases (such as FilterErrors raised by some filters) instead of
raising an exception. Since run_with_argv is called directly here, we
need to check its return value and raise a Django CommandError if the
build command indicated a failure.
"Merge pull request #29 from wyattanderson/master\n\nEnsure errors from build script are raised"
Update to new webassets resolver API.
Old deprecated settings now been removed in core.

Remove workarounds and tests.
No longer test for 2.5, tox has dropped support as well.
Fix tox run: Django 1.1 no longer online, it seems.
Is it possible that Travis is using a cache?
Python 3 fixes, add django 1.6 in tox
Add plugin that initialises django_assets in pytest

This ensures that django_assets configuration settings are not removed after
each pytest test run.
"Merge pull request #33 from aptivate/pytest_plugin\n\nAdd plugin that initialises django_assets in pytest"
Fix Globber.resolve_pattern string type check
Docs: fixed incorrect reference
"Merge pull request #38 from julen/doc-fix\n\nDocs: fixed incorrect reference"
"Merge pull request #35 from TigorC/master\n\nPython 3 support"
Depend on most recent stable webassets.

Same as in flask-assets, we no longer feasably depend on non-PyPi
hosted packages.
Use ASSETS_DEBUG instead of DEBUG

Django sets DEBUG to False while running unit tests. Thus, DEBUG is not a good indicator for staticfiles usage, but ASSETS_DEBUG is a better one.

This problem is described in https://github.com/miracle2k/django-assets/issues/3
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.
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