.gitconfig → Fix the Git Umlaut problem on Mac OS X

Set precomposeunicode = false to fix the Git Umlaut problem on Mac OS X

* Prevent showing files which filenames contains umlauts as unversioned
* Needs to be false since OS X 10.9.x
* See http://michael-kuehnel.de/git/2014/11/21/git-mac-osx-and-german-umlaute.html