RTL: fix position of help icon in filter_horizontal m2m widget

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extra : rebase_source : a201efaee395d8d3bff8e88799c30830346a9e2b
Update bugfix.

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branch : bugfix
Remove content from DisplayableAdmin's search_fields since content is not defined on Displayable and may or may not be present on a model that subclasses it and uses the DisplayableAdmin.

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branch : bugfix
Added yoursongyourstory.org to the readme
569 - replace uses of STATIC_URL in templates with 'static' template tag
site is never assigned when hostname is set, single line addition fixes the problem
Don't depend on unloaded comment state for determining parent-most level of replies in comment_thread template tag.
Merge
Fix KeywordsField swapping of name in model's search_fields when a sequence is used.
Moved the logic for building up search fields in SearchableQueryset into a new method SearchableManager.get_search_fields, which allows externally retrieving the search fields dict that will be used.
Use model's search_fields to populate DisplayableAdmin.search_fields.
Merge
Merge
Fix use of JQUERY_FILENAME with static template tag.
Added David Lawrence to AUTHORS
Add compress tags to js/css in base mobile template.
Fix empty thumbnails for fielbrowser fields in AdminThumbMixin.
Added Basil Mironenko to AUTHORS
Added AJAX/JSON handling for comment/rating login redirects, and comment form errors.
Allow migrations and fixtures to run from scratch without mezzanine.pages installed.