Django-pipeline

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* Various build improvements.
* Improved setup.py classifiers. Thanks to Sobolev Nikita.
* Documentation improvements. Thanks to Adam Chainz.

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* Made templatetags easier to subclass for special rendering behavior. Thanks
to Christian Hammond.
* Updated the link to readthedocs. Thanks to Corey Farwell.
* Fixed some log messages to correctly refer to the new PIPELINE settings
tructure. Thanks to Alvin Mites.
* Changed file outdated checks to use os.path methods directly, avoiding
potential SuspiciousFileOperation errors which could appear with some django
storage configurations.

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* Add a view for collecting static files before serving them. This behaves like
django's built-in ``static`` view and allows running the collector for
images, fonts, and other static files that do not need to be compiled. Thanks
to Christian Hammond.
* Update documentation for the ES6Compiler to clarify filename requirements.
Thanks to Nathan Cox.
* Add error output for compiler errors within the browser. This provides for a
much better experience when compiling files from the devserver. Thanks to
Christian Hammond.
* Make unit tests run against Django 1.6 and 1.7. Thanks to Sławek Ehlert.

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* Fix filtering-out of files which require a finder to locate.
* Allow compilers to override the output path.
* Fix error reporting when a compiler fails to execute.
* Fix IOErrors when running collectstatic with some nodejs-based compilers and
compressors. Thanks to Frankie Dintino.
* Fix compatibility of unit tests when running on Windows. Thanks to Frankie
Dintino.
* Add unit tests for compilers and compressors. Thanks to Frankie Dintino.

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* Fix Django < 1.8 compatibility. Thanks to David Trowbridge.
* Allow to disable collector during development. Thanks to Leonardo Orozco.

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* Fix compressor subprocess calls.