MozStumbler v0.99.0.0

This is the last release before the play store (we think!), which will be 1.0.
We changed the signing key for the binary, so the auto-update won't auto-update. Builds <1.0 from github will need to be uninstalled before installing 1.0 or higher. This only needs to happen once, after that, the updater will work as normal.

#1089: Greater minimum zoom on screens <500px wide
#1121: Crash in showing MLS locations
#1103: added more logging on 400 errors to catch why we are getting 400 errors

Various work to improve the Log activity for better logging.
More work on OSMDroid related to memory reduction and coverage tile expiry