updated mozstumbler
added mozstumbler v1.2.1 release
Merge branch 'master' into 'master'

Link to latest version of MozStumbler

I've added an entry for v1.2.1 of the MozStumbler.

I think we've addressed all issues that were mentioned before.

The F-Droid API keys are now stored in android/properties/private-fdroid.properties

https://github.com/mozilla/MozStumbler/blob/6ac3faeccfcccf79952b82e0b3c8abf9911c138b/android/properties/private-fdroid.properties

The dependency to SimpleKML now goes through JCenter

https://bintray.com/crankycoder/SimpleKML/SimpleKML/view/files/com/crankycoder/SimpleKML/1.0

See merge request !338
Mozilla Stumbler: Clean up.