Merge pull request nightscout#226 from nightscout/dev

2.8.1.1

Merge pull request nightscout#215 from nightscout/2.8.1prep

2.8.1 release

Merge pull request #147 from nightscout/2.8.0prep

2.8.0 release

Merge pull request #1 from nightscout/dev

2.7.0 release