Update monthly release doc

/cc @sytse @jacobvosmaer @marin

Official location

I got two today:
https://twitter.com/wonderb0lt/status/456545094644936705
https://twitter.com/madpew/status/456758525398884352

Rc1 updates

#1178

Please check it well 😃

If this gets merged, the annotated version tag 6.8.0.rc1 will point to https://dev.gitlab.org/gitlab/gitlabhq/commit/e6b668ab0169f981a5c4162cd8625daf02e6f5a8

/cc @sytse @jacobvosmaer @marin

fix bundle install error

Removed missing sass selectors

fix issue of bundle install error after slack-notifier upgraded. upgrade to 0.3.2

Fixed multiple close issue #6615

Restful naming

The name endpoint is more common for RPC interfaces http://en.wikipedia.org/wiki/Web_Services_Description_Language#Objects_in_WSDL_1.1_.2F_WSDL_2.0 where the url is the same for different calls on the same endpoint. With restful interfaces the url changes.

Routing for groups

Implements http://feedback.gitlab.com/forums/176466-general/suggestions/5723800-group-url-on-root-path-groups-name-instead-of-g

Active users

Show the number of active users in the dashboard.

Prevent-two-links-in-emails

Only one link per email to prevent clicking the wrong one.

Issue 155: Slack-notifier update to fix 500 errors

Slack-notifier 0.2.0 is broken for Rails 1.9.3

This update bumps the Gemfile/Gemfile.lock to use 0.3.2 version of the gem file to correct the issue.

slack-notifier changelog addressing the issue

https://github.com/stevenosloan/slack-notifier/blob/master/changelog.md

Issue 155 about the error

https://gitlab.com/gitlab-org/gitlab-ce/issues/155

Rename issue form tags Subject -> Title and Details -> Description

Use VersionSorter on the Project > Tags page

Make the db and statemachine default is the same

Show actual commit count on project dashboard

Satellite exists in automerge check

Speed up wiki pages page

Simple pointers in readme

Link to oauth doc

Possible after https://github.com/gitlabhq/gitlabhq/pull/6741/files

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