fix problems with german "Umlaut" in folder name
revert previous fix and added normalizer to cache class
added normalizeUnicode() method to OC_Util
changed builtin normalizer to \OC_Util::normalizeUnicode
changed tests for using new normalizer
Merge branch 'master' into fix_for_2377
submodule 3rdparty updated
prevent for returning while false normalize string
added more places where normalization is needed
we should also normalize on update and search because the database layer will not do this for us
improved tests to check if database layer normalize folder names
Merge branch 'master' into fix_for_2377
Merge pull request #3459 from owncloud/fix_for_2377

fix problems with german "Umlaut" in folder name