Updating owncloud github repo and moving cartridges to newer versions

At this moment the quickstart under openshift/owncloud-openshift-quickstart is more up-to-date than the one at ichristo/owncloud-openshift-quickstart. Also it defaults to newer versions of cartridges: php-5.4 and mysql-5.5 instead of php-5.3 and mysql-5.1. Updating the descriptor to reflect that changes. Notice I didn't update created_at, updated_at and related fields.