Changed the client Spanish translation

As per my previous pull request.
(experimental) added framework for filtering all sorts of internals in discourse and consuming by plugins
Merge pull request #1515 from davguij/master

Changed the client Spanish translation
update images:pull_hotlinked rake task to add support for the markdown reference link style
Fix broken markdown formatting.
Fix rendering of muted topic button
add educational hint in the upload selector dialog
For @Sam - hide the poster expansion if you click on the avatar of the user who's expanded
Merge pull request #1517 from nverba/patch-1

Fix broken markdown formatting.
removes redundant context binding