core: m_rsc_update, add explicit category check.
This adds an extra security for those cases where an ACL module doesn't add strict category modification checks to #rsc_update_check{}
mod_menu: (admin) make active menu item more visible by changing background color.
mod_base: fix stringify for {trans, _} tuples.
mod_admin: show category in connection list items.
mod_base: fix stringify for floats in 0..255 range
core: slightly more robust z_render:render/2 for non-character/binary values.
mod_import_csv: remove superfluous lager messages about escaped chars.
mod_admin(_frontend): add optional save & view location.
mod_search: extend keyword_cloud search

Add keywordpred and keywordcat to create custom clouds different from
subject/keyword.
Add cookbook item on creating custom content blocks
mod_admin: new-rsc dialog callback; optionally accept other rsc properties than the standard ones.
This makes it possible to add category specific rsc creation templates to the new-rsc dialog.
doc: Document how to set m_config values in the site's config
mod_ssl: Fix for generating absulute urls when there is no request data
Merge pull request #669 from cillianderoiste/master

Add cookbook item on creating custom content blocks
docs: mod_ssl, add explanation how to generate the .csr file for certificate authorities.
core: periodic process to unlink deleted medium files (and their generated previews)
mod_admin: show i18n 'widget_content_nolang_before' block also in std widget. Fixes #671
mod_oembed: view embedded content using https:// iff the content is view using a secure connection.
Fixes #673
core: flatten escaped js to a binary.
mod_admin(_frontend): set delegate for sorting edges, so that edges can be sorted in dynamically loaded content using the admin_frontend.