close file handler after readdir()
bug fix for issue 1739, two changes included:

* 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.
remove obsolete variables
allow user to delete selected files from the trash bin permanently
use  instead of
add missing paramenter to post request
change $_REQUEST to $_POST; fix check if file was successfully deleted
rebase to master
initialize $result
add timestamp to function call; fix trash.js to handle multiple delete operation at once
use "|" as delimiter instead of ";", since "|" is not allowed in file/folder names
switch to json encoded file list
change for loop to make it hopefully work with IE
WebDAV-Testing:
- write the exception to the log
- in case curl is missing we should return true as well
Merge branch 'master' into trash_bin_delete_selected
Merge pull request #1773 from owncloud/trash_bin_delete_selected

Trash bin delete selected
[tx-robot] updated from transifex
Merge pull request #1768 from houqp/issue_1739

bug fix for issue 1739
Merge pull request #1812 from owncloud/add-logging-to-webdav-test-master

Enhancment to the WebDAV-Testing ...
make number-input fields look like they should