Django-fiber

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* upgrade CKEditor 4.4.7 -> 4.5.4

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* run tests on Django 1.8, fix test failure
* tox.ini uses new features of tox
* load Fiber page data and contentitem groups async, makes navigating pages with Fiber enabled much faster
* fix incompatibility with django-compressor running in offline mode
* handle lazy URLs
* fix behaviour of show_page_content for non-Fiber pages
* make editable_attrs a bit smarter
* use a box shadow to show editable items
* don't open a dialog window for unknown editable items, go to the edit url instead, in a new tab / window
* enable context menu to edit non-Fiber items
* fix context menu for non-page contentitems
* open the correct dialog (content item vs page) on double click
* refactor and test show_menu and other template tags, use generator expressions
* refactor deprecated page_info contextprocessor to reuse FiberPageMixin logic
* fixed an issue where the root node was included when mark_current_regexes matches
* test and refactor FiberPageMixin, FiberTemplateView
* test and refactor AdminPageMiddleware, ObfuscateEmailAddressMiddleware
* refactor import_util, load_class
* overall test and test coverage improvements
* numerous small fixes and improvements

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* Implemented Django's static template tag to support Django 1.8
* Fixed an error where context menu would not show when right-clicking a fiber content item

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* Updated Sphinx settings to work with Django 1.7
* Upgraded CKEditor 4.3.2 -> 4.4.7
* Re-use of default CKEditor icons for most of the icons
* CKEditor icons now also support hidpi/retina screens
* Corrections for aggressive styling in dialogs
* Brought back the original South migrations in there own `south_migrations` directory
* Fixed login issue with Django 1.7
* Pinned djangorestframework to >=2.3.8,<3.0 in setup.py
* Fixed image selectors in markitup editor
* Fixed easy_thumbnails exceptions
* Handle ProtectedErrors user friendly
* Fine-tunes in several (new) messages and their Dutch translations

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* Support Django 1.7

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* More config settings for CKEditor (this is no joke)