Merge pull request #430 from eMerzh/pg_shared_sabre

Correct quoting error with Sabre connector. Fix critical pg pbms

lib/connector/sabre/node.php

@@ -278,7 +278,7 @@ static public function removeETagPropertyForPath($path) {
 
  //remove etag for all Shared folders
  $query = OC_DB::prepare( 'DELETE FROM `*PREFIX*properties`'
- .' WHERE `propertypath` = "/Shared"'
+ .' WHERE `propertypath` = \'/Shared\' '
  );
  $query->execute(array());