First version of S3 cloud files store support.
Merge branch 'master' into mw-filestore
mod_base: add GB to filesizeformat filter.
Better handling of errors.
Added error entry to filestore.
Fixes to race conditions.
Added download/upload all files options to admin ui.
docs: added stubs for new (filestore) modules, controllers and tpls.
docs: mod_zip is coming later...
docs: added first docs about controller_file.
Remove controller_file_readonly and controller_lib docs
mod_base: remove controller_lib, now replaced by controller_file
mod_base: merge 'acl' option from controller_file_readonly into controller_file.
core: set the base of relative root paths to the files directory of the site.
docs: small changes to controller_file doc
mod_filestore: fix retry after upload error.
mod_base: controller_file, is_authorized defaults should be true.
core: take the filestore-cache-entry's creation time as the modification time.
Merge pull request #738 from mawuli-ypa/master

build: Add IRC notifications to Travis builds
core: maintain history of previous rsc page_paths

A new table, rsc_page_path_log, keeps an administration of old page
paths for redirecting the old page path to the new page path when the
page path changes. This is important for SEO and for keeping links
working when the page path changes.
core: fix SVG mime type mapping from ImageMagick identify.
core: execute page_path log update into rsc update transaction
Uniformity: use space before slash

Make similar to _admin_edit_sidebar.person.tpl
typo