fix(graphite): minor fix/improvement to graphite error handling when doing metric exploration in query editor, fixes #5778

* One of the homebrew folks first asked for a wrapper script to make launching grafana easier. Later I was asked to remove it and submit it upstream, so here it is.

* add instructions for installing grafana HEAD from git with homebrew back to the docs

* One of the homebrew folks first asked for a wrapper script to make launching grafana easier. Later I was asked to remove it and submit it upstream, so here it is.

* add instructions for installing grafana HEAD from git with homebrew back to the docs

Merge branch 'issue-3063' of https://github.com/alexanderzobnin/grafana into alexanderzobnin-issue-3063

closes #5739

Fix Elastic datasource tests - use moment.utc() instead moment() to prevent timezone-related issues, fixes #5733. (#5746)