Merge pull request #159 from zivchang/next

[bug fixing] PTSDK-1436
[bug fixs] PTSDK-1337
- Changed the network unavailable overlay to only cover the map.
Merge remote-tracking branch 'upstream/next' into next
Merge pull request #160 from jacobchen/next

[bug fixs] PTSDK-1337
[bug fixs] PTSDK-1124
- empty the options before load back the settings.
Merge pull request #161 from jacobchen/next

[bug fixs] PTSDK-1124
[bug fixing] PTSDK-1440

fix getCachedMessage always return empty NDEFMessage