Remove xmlns from all but the most outermost tag
Remove 'map' button for external map as it's built-in now
Use explicit version string in AndroidManifest.xml ...

... to address an ADT warning.
Bump up version to 0.1.6 (alpha)
Clarify comment
Catch a potential null pointer bug
Run map update on main thread to avoid crash
Bump up version to 0.1.8 (alpha)