Fix map item behavior when used with a MouseArea.

Update the geo coordinate properties when the map items are moved.

Change-Id: I32918571379d81c651e652513b63945ee23e3fd9
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Work around broken Map mouse tests.

Due to QTBUG-36560 some map mouse tests were failing. Implement a valid
workaround until it is fix.

Change-Id: Iec67f82d2e2a9792ed067b9cd956345ab38e7ab7
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>