Continuous rescan+reconnect for device if disconnected
Fix issues resuming the app from background

Service doesn't need UI thread to notify on the characteristic.
Service is now becoming rather specific to HR, will need to refactor for flexibility in notifying on other services...
Store values in database

Currently a trivial example - table is cleared and printed after 10 values
Successfully POST data to Fluxtream

Very hard-codey, but works!
Allow fluxtream credentials to be edited