Add getSW and getNE to LatLngBounds.
Added getCenter method
$entry usage now in such a way that really works on latest GWT/Vaadin versions
Merge pull request #13 from Antea/feature/rectangle

Add getSW and getNE to LatLngBounds.
Using primitive as parameter type instead of wrapper type for better developer mode compatibility

closes #7
[maven-release-plugin] prepare release g-leaflet-0.4.7
[maven-release-plugin] prepare for next development iteration