getting_started.md: cd to unpacked dir

Catch up with Go 1.5.

Remove the example.

Add Benjamin Staffins slides to the media section

Add Apache exporter to list of 3rd party exporters

Prom org url for Docker Hub incorrect

https://registry.hub.docker.com/repos/prom/ no longer works

https://hub.docker.com/u/prom/ seems to work as expected.

Rename statsd_bridge to statsd_exporter

Document the instant rate.

Hamming up the "angry" meaning just a tad.

Use stronger wording for the text format order

The Python parser already depends on it, and the Go parser will soon
(once it supports streaming parsing). So the order is a "must", not a
"should".

Require that metrics be grouped together for text format.

Fix typo: my -> may

Merge next-release into master

fixes #221

The 'labels' setting in the global configuration section has been renamed to 'external_labels' and now has changed semantics. Hence, the fix.

Fixes https://github.com/prometheus/docs/issues/180

Improve docs around random example build prerequisites.

Add FLOSS Weekly interview to Media page.

Update wording around "Tabular"/"Console" view.

https://github.com/prometheus/docs/issues/226

Fixes https://github.com/prometheus/docs/issues/225

Document new name and semantics of external labels.

Fixes https://github.com/prometheus/docs/issues/203

Fix spelling of required.

Fix typo, JXM -> JVM