This adds three more steps to the Travis tests.
1. Compile Elm -> script.js
2. Bundle html.index & script.js -> bindata.go
3. Check if bindata.go hasn't changed
Building a hash over an entire set of alerts causes problems, because
the hash differs, on any change, whereas we only want to send
notifications if the alert and it's state have changed. Therefore this
introduces a list of alerts that are active and a list of alerts that
are resolved. If the currently active alerts of a group are a subset of
the ones that have been notified about before then they are
deduplicated. The resolved notifications work the same way, with a
separate list of resolved notifications that have already been sent.
By passing "-modtime 1" flag into go-bindata command it uses the same
unix timestamp (1) for every file in the fake filesystem. Thereby every
execution of "make assets" results in the same asset outputs if the
inputs were the same. This forces us to set the "Cache-Control"
attribute to "no-cache".
* Including glue between Alertmanager server and Elm UI.
* Rebuilding assets (ui/bindata.go).
* Exact commit: 'bd78de6b16bcefaacf4229304d439b33aa09cc72'
* Subdirectory: ui/app