gargoyle ifswitch support
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Merge branch 'release/1.2' into develop
Merge pull request #298 from prezi/gargolye_ifswitch_support

gargoyle ifswitch support
Fixed link to Read The Docs as underscores are not allowed in subdomains.
Merge branch 'develop' of github.com:jezdez/django_compressor into develop
Fix readthedocs link.
Merge pull request #299 from overshard/develop

Fix readthedocs link.
COMPRESS_PRECOMPILERS allows filter classes

As discussed in #179, the second item in the tuples can now be the
full name of a filter class, e.g. `dotted.path.to.CustomFilter`.
Test that precompiler classes are used
Update docs to mention precompiler classes
Fail loudly on AttributeError
Test that exception is raised for nonexistent precompiler

If the class provided to `COMPRESS_PRECOMPILERS` doesn't exist (but
its module does), an exception should be raised.
Passing the tag attributes to the precompiler class
PEP8 cleanup
Fixed class-based precompiler tests
Merge pull request #313 from anttihirvonen/precompiler_class_support

Precompiler class support (cleaned & tests fixed)
Support cache-busting suffix on asset URLs with fragments.
Support cache-busting suffix on asset URLs with querystrings.
1.2 is not unsupported, remove all references to MEDIA_* (users should have moved to STATIC_* by now) as well as 1.2 stuff in the documentation.