Django-template-engines

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Improve:

* automatic escape break line in odt template

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Improve:

* Tags are renamed
* ODT image inclusion


Update:
* From now on, ``{% ... %}`` are also cleaned.

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Other:
* the template is cleaned before it is filled.

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Optimize:
* clean methods

Add:
* a method that removes incorrect additions in the template tags of the xml file

Update:
* the documentation

Fix:
* requirements

Other:
* ``AbstractEngine`` becomes ``ZipAbstractEngine`` and allow you to write
custom engines for zip base documents

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Fixes:
* template generation from different django storage

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Fixes:
* conditions to determine mimetype template