Get unix timestamp from `time` var for alert messages.

The notification contains a link to a Grafana dashboard. Is there a way to add the timestamps to a link?

i.e.

`http://192.168.1.10:3000/dashboard/db/device_1_live?from=1462448901244&to=1462452501244`

My message now:

> .message('Cycle failed. Current cycle {{ index .Fields "Cycle" }}. Total cycles failed: {{ index .Fields "TestFailed" }}. Cycle failed on device Device_1. for details!')

I want to know if there is a way to calculate the value of from and to using TICK. I found something here but I don't know if this is what I need. If yes can you post an example? The ideea is that I want to add a link to Grafana to see some hardware metrics when a test fails and I need the timestamps. Thanks again.

From @bogdanveres in #508

Start with the TICK `.message` template shown in the issue and the Grafana dashboard URL parameters. Determine how alert timestamps can be exposed for use in `from` and `to`, then verify that a generated notification links to the intended time range.

Written by the indexing model from the issue text.