initPaths: set include path before any owncloud function is called

Ensure we can find basic owncloud classes while detecting the owncloud
paths in function initPaths by add OC::$SERVERROOT . '/lib' to include
path before any owncloud function is called.

This fix a bug with XAMPP that cannot find the class OC_Config in
function OC_Request::scriptName when called from function
OC_Base::initPaths.
Dav: don't overwrite etag from filecache with old etag from properties table
Dav: update etag in filecache when doing a PROPSET
Merge pull request #1419 from owncloud/etag_fix

Dav: don't overwrite etag from filecache with old etag from properties table
[tx-robot] updated from transifex
Merge pull request #1422 from TheSFReader/master

Correct the Cache Scanner so that it doesn't try and scan subdirs of a non-dir path when renaming
Merge pull request #1416 from herbrechtsmeier/set_include_path_early

initPaths: set include path before any owncloud function is called