Document HTTP API v1.

Update exporters.md

Hi,

I've added a link to rabbitMQ exporter.

Kris

Add back Prometheus target to last config example.

Fix link anchor fragments to relabeling docs.

Remove explicit list of client libraries from FAQ.

Docs improvements

Sort list of client libraries alphabetically

Mention Haskell client library

Add Jamie Wilkinson's  Monitorama workshop to media

Document humanizeTimestamp template function.

Guest Post: Monitoring Dreamhack - the World's Largest Digital Festival

This is a guest post on how the networking team on DreamHack used
Prometheus to enhance our monitoring.

Document binary operator precedence.

Update label matching documentation.

This commit adds documentation about the limitations of empty
label matching and documents the `__name__` label which is useful
for federation.

Add a blog post on detecting and dealing with outliers.

Add slides we\'re aware of to the media list

Add and fix a number of minor things.

Conflicts:
	content/docs/instrumenting/exporters.md

- Sort exporters lexicographically (but still put the node exporter first).
- Call "unofficial" exporters "independently maintained" exporters and
  adjust the wording around it.
- Add the resurrected Munin exporter.
- Add the crucial information about RAM to the benchmark results.
- Add a new "media" section for introductory blog posts and talks.
- Refer to that section instead of the SC blog post in the Overview.

Note about Stapelberg's talk: As it is in German and without
subtitles, it is only approachable for a limited audience, but it is
in fact a very good introduction, so I opted to list it here in last
position. Measured in "number of Wikipedia articles", German is the
2nd most important language on the Internet after English. So I hope
it's not completely obscure.