replace Google Charts sources with Gauge.js
render the Donuts
style the donuts
give donuts different colors based on the uptime

less then 90% up: red
less then 95% up: blue
less then 99.5% up: yellow
more then 99.5% up: green
Merge branch 'feature/donut-gauges' into develop

* feature/donut-gauges:
  give donuts different colors based on the uptime
  style the donuts
  render the Donuts
  replace Google Charts sources with Gauge.js
version bump to 1.2.0