Fix with updated HTTP usage and wifi works during doze mode

This release fixes a long standing issue with doze mode (since Android 5) - where battery optimization means the Nightscout app was disabled from using wifi after device went to sleep.

Users must now accept permission to disable battery optimizations for this app, and it will then work > 2 hours uninterrupted.

Modified 2015-05-06 - original build was incorrectly signed so unable to install. Disabled instant-run as this prevented successful subsequent installs :(

v2.1-alpha.5

Rebuild with latest JDK, no code changes

Using new serial library, many many fixes

Alpha quality, for testing after new serial library, more refactoring.

Quick fix release

v2.0-alpha.3

Fix: Hangs if given bad (hex) sensor ID

First build release from my repository

This is supposed to have same functionality as the original repository, but the codebase substantially shrunken.

Have removed deprecated direct-to-mongo data feeding, all input goes via the REST API instead.