Glue

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* New ``--imagemagick`` option. If present, glue will use ImageMagick to scale down retina sprites instead of Pillow 72.
* New ``--imagemagickpath`` option 72.
* Soft 2px default for margin no longer exists 73.
* Fix how glue choose which classes to add to the global scope in order to add pseudo-classes if needed 77.
* Fix camelcase separator as it wasn't preserving original case 74.
* Fix sprites containing images with filenames included in PSEUDO_CLASSES 59.

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* Fix ProjectSpriteManager issues.

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* Improve error messages.
* Added variable ``identifier`` to ``--each-template``.
* Glue now require ``Pillow==1.7.8``

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* Fix maximum recursion depth issues in ``ConfigManager``
* Update Documentation.

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* New ``--recursive`` option.
* New ``--follow-links`` option.
* New ``--sprite-namespace`` option.
* Speed up improvement: Glue is now 1.3x faster in a cold run.
* Speed up improvement: Glue is now 14x faster for already created sprites.
* Glue now store some metadata inside the generated sprites in order to not rebuild them again if the source images and settings are the same.
* New ``--force`` option to make glue rebuild the sprites.
* New ``--no-img`` and ``--no-css`` options.
* Fix some CSS aligment issues related with odd sized images.
* A soft default of 2px of margin is going to be added while using glue with ``--ratios`` or ``--retina`` in order to fix scaling noise.
* Fix ``--url`` in order to override relative path calculated by ``--img`` and ``--css``.

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* Glue now require Pillow instead of PIL (http://pypi.python.org/pypi/Pillow/)
* Improve compatibility with less allowing variables in the urls (Thanks rafeca).
* Fix cachebuster issues with --retina and --url