Notifications: fix android 4.x compatibility

NavDrawerBuilder: allow initial calibration in more situations

Wear: Update Robolectric version and config

Update Robolectric version and config

Update espresso tests

Merge branch 'master' of https://github.com/NightscoutFoundation/xDrip …

…into jamorhamvoice

LibreReceiver: check for null pointers

JamBaseBluetoothSequencer: add getter

Merge branch 'master' of https://github.com/NightscoutFoundation/xDrip …

…into jamorhamvoice

Merge branch 'master' of https://github.com/NightscoutFoundation/xDrip …

…into jamorhamvoice