Update README.md - add links (useful from Android browsers), update Disclaimer (from wiki version), plus other tweaks

Fix #16 - show registered USB sticks in the registration activity
Fix #14 - show successfully registered devices after CareLink login.

Removed new issue log reference (as per template change) and removed team members (as now mentioned in Wiki: Support)

Make only the log part of the UI scrolls.

* 'master' of https://github.com/pazaan/Medtronic640gUploader:
  Update CONTRIBUTING.md

Credit  [android-service-example](https://code.launchpad.net/~binwiederhier/+junk/android-service-example)

* 'master' of https://github.com/pazaan/Medtronic640gUploader:
  Create ISSUE_TEMPLATE

Fix #12

Add comms retries when entering control mode, to handle the scenario where the app is launched with the plugging in of the USB stick.

Fix #6

- Refactor MedtronicNG class names
- Add support for uploading Pump status to Nightscout (pump battery, IOB, reservoir level)