* content: clarifications around adding a new team member in governance

* content: governance proposal feedback changes

* content: new team member wording suggestion

* content: new member governance changes feedback

* Document smtp_hello parameter

* Document text parameter for email_config

content: add Krasi Georgiev to Prometheus team members

add skipper as software exposing prometheus metrics

hipchat_url is wrong and should be hipchat_api_url.

Clarify current exposition format support

Fixes prometheus/alertmanager#1221

PingCAP is the team behind [TiDB](https://github.com/pingcap/tidb), which is using  Prometheus to monitor the database.

It has been changed to use the Pagerduty v2 API by default in Alertmanager.

https://github.com/prometheus/alertmanager/blob/master/config/config.go#L324

Add governance

Add release 2.1 of Prometheus

Signed-off-by: Goutham Veeramachaneni <cs14btech11014@iith.ac.in>

[This pull-request](https://github.com/prometheus/prometheus/pull/984) renamed the `__meta_dns_srv_name` to `__meta_dns_name`.

Mostly language and style fixes. Cross-project discussion _should_
happen on the mailing list.

and instead make a new "page" layout for markdown-based pages. This
avoids changing the HTML based pages which are using the "default"
layout currently.