Cmsplugin-filer

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* fixed some dead imports from cms that were failing with django-cms 2.4
* django 1.5 fixes (not officially supported yet)
* many bugfixes

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* restores thumbnail options and use autoscale to image plugin (was accidentally removed)
* translation updates

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* adds support for drag'n'drop adding of files in djangocms-text-ckeditor
* adds .as_dict property for ThumbnailOption

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* adds target blank option for links in image and file plugin

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* don't verify the url fields (since they might contain relative urls)
* fixed license file
* adds support to not resize images at all

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* various bugfixes
* new link plugin
* Django 1.4 support
* django-cms 2.3