bug fix for issue 1739

Trash bin delete selected

replaced for in loops with normal enumerating loops to fix #1803

Add message when trouble sending email ref #1799

Extra position check for multiselect dropdown. Fix app/issues/575

Ability for the action handler to get more info on the current file

Update apps/files_versions/js/versions.js

Versioning app use new filesystem api

Update office icons

Fix "All version..." button not clickable.

Reason is Google Chrome blocking inline javascript execution.

Give storage backends the option to define having no known free space

fix erroneous CSS, remove obsolete selectors

Bug fix for Issue#1688

Fix for Undelete directory action

JSON mount config: no pretty print

* fix typo in OC_Group_Database::DisplayNamesInGroup's SQL clause
* check array_diff return value in OC_Group::displayNamesInGroups,
  when there is no difference between two arrays, it will return
  NULL, so we have to take care of it.

Use json for new mount configuration files

files_versions no longer contains a personal settings page -> remove the...