switch from Google Maps to OsmDroid, WIP
osmdroid mapview in progress - all pins added to map
added MarkerData to cell tower overlay items
implemented async map building and cleaned up
fixed null pointers on a clean install
fixed default location usage
merged changes from upstream
updated changes from upstream
cleaned up info window dialog box
Update CHANGELOG.md
Merge pull request #122 from tobykurien/master

Remove Google Play Services
Update CHANGELOG.md