Add BlackBerry positioning plugin for QtLocation

Note files in bb subfolder are considered temporary and
will be removed when equivalent functionality has been
incorporated in Qt Core or BB10 core on Qt5.

Change-Id: I08d2c771d18914525fad410f1b6e83772ef3a0d7
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Liang Qi <liang.qi@digia.com>