* Renamed PostReport to Report
* Added report button to SPV
* Updated rspec

refs diaspora/diaspora#4732
refs diaspora/diaspora#4710
refs diaspora/diaspora#4711
refs diaspora/diaspora#4517

This new class replaces all existing server side message
rendering helpers and is the new global entry point for such
needs. All models with relevant fields now expose an instance
of MessageRenderer for those. MessageRenderer acts as
gateway between the existing processing solutions for markdown,
mentions and tags and provides a very flexible interface for
all output needs. This makes the API to obtain a message
in a certain format clear. As a result of centralizing the
processing a lot of duplication is eliminated. Centralizing
the message processing also makes it clear where to change
its behaviour, add new representations and what options
are already available.

Actually load a different section when requested in get_javascript_strings_for, add spec for changes in JS i18n helper

extending loaded js locales.

cleaned up unused routes. removed some comments. loading help locales only on help view.

removed afterRender from backbone views. extended load_javascript_locales method to take a section.

Started converting the help section into a backbone view. Things missing are: some urls which were calculated and inserted into the yml, all the pre-existing erb templates are still there, it's still at /faq/faq, nothing has been tested, some of the questions don't collapse and expand.

changed the locales to have the hard coded urls in them because they can no longer be calculated server side. this is pretty crap because i'm going to have to change it for all the languages now so i might change my mind about this later.

deleted some unused views.

* Hopefully fix OEmbed view
* Fix OpenGraph view
* Fix middle border
* Add spacing at the bottom
* Fix comment styles by not including old SPV styles for them (TODO: maybe rescue some stuff there, like the code tag styling)
* Fix avatar size for default avatar
* Remove border below comment pane
* Fix overflow of post body with a lot of text
* Fix stylesheet inclusion

Style fixup

Fixed small-frame opengraph view

Fixed incompletely saved OpenGraphCache bug

clarify regexp and correct some bad backtracking

add specs

rewrite regex

convert mardown style title to plain text title

fix bad indentation

add jasmine test for post-viewer.js

tries to fix bad jasmine test

Fixed bug in app.js, removed unnecessray test

Fix hashtags that start a line when posting to Facebook or Twitter, by applying all the same options to strip_markdown as applying to markdownify, fixes #3768 and #4154

markdown link to their profile (fixes #2516)

add failing spec for #4160 / #2516

extend the spec a bit more

refactor mention handling in a status message

add method for filtering mentions by aspects

wire mention filtering into the status message model, adapt a few tests to
work properly

cosmetic changes

shorten helper methods

add changelog entry

Add test for posts helper

* Rename and reorganize post fetcher to fix autoloading, also let it use
  Faradays default connection so we get nice redirects
* Add initializer to load libs at a central place
* added lib dir to autoload_once paths to increase thread safety
* Moved lib/exceptions.rb to lib/diaspora/ to conform namespacing