merge changes discussed in dcneiner pull number 4 'fix for autocomplete issue' including firefox password overlay

LDAP: ldap_explode_dn escaped too much, fix it by manual replacement. Fixes different problems, esp. with non-ascii characters in the dn (#631)

fix regression in file versioning for shared files

Minor cleanup in OC_OCSClient::getKnownledgebaseEntries. Fix for #487

fix checkstyle for files_encryption & files_encryption app, add whitespace for readability

Update lib/image.php

Corrected simple typo

Group name doesn't need to be sanitized before storing it in the database

fix checkstyle for files app

Sharing: Fix false positived v. 2

OC_FSV->copy now only caches files which are copied from data/user/files

provide a safe way to end output buffering

Fix #600

This reverts commit a5774229.

Cleaned up docblock comments

More tests for lib/group.php

show drag shadow in firefox by using helper:'clone'