Truncate commit messages after subject line in table

Commit messages are now additionally truncated after the first line.
Before, a commit message's body was attached behind the subject which
made messages hardly readable in some cases.

![gitlab-ci-truncate-commitmsg](https://gitlab.com/dgerhardt/gitlab-ci/uploads/a0c601eb1abbce7a7b9e4e0e3f16f303/gitlab-ci-truncate-commitmsg.png)

See merge request !213

Fix inline edit runner-description

Fixes: #217
Replaced .show and .hide with .removeClass('hide') and .addClass('hide') (Like done for #192 in MR 177)

See merge request !206

Commit messages are now additionally truncated after the first line.
Before, a commit message's body was attached behind the subject which
made messages hardly readable in some cases.

Adjust CI config to support Docker executors

A shell script (based on the one for GitLab CE) has been added to
support Docker executors. Tags have been added to make sure builds are
only executed on appropriate runners.

This makes it possible to test forks of the GitLab CI repository on
public runners. Previously, builds failed with the following error:

```
$ bundle --without postgres
/builds/eldamir/gitlab-ci.sh: line 29: bundle: command not found

ERROR: Build failed with: exit code 127
```

See merge request !212

A shell script (based on the one for GitLab CE) has been added to
support Docker executors. Tags have been added to make sure builds are
only executed on appropriate runners.

Detail that people can use script to do `rake rspec` but also to call a `tests.sh`



See merge request !209

* commit '19c8544b':
  update changelog

Fixes a bunch of spelling/grammar mistakes.

There were many spelling mistakes, which ultimately distracted
from the content it was describing. This commit fixes all that
I could find, and rewords some sentences to improve clarity

See merge request !211

There were many spelling mistakes, which ultimately distracted
from the content it was describing. This commit fixes all that
I could find, and rewords some sentences to improve clarity

Update changelog



See merge request !167

Fix invalid link to doc.gitlab.com

/cc @vsizov 

See merge request !207

* commit 'a7d59ed9':
  Fix rendering issues
  Rework CI documentation by adding informations about YAML, the use of Docker images and building them

Fix permission escalation

This fixes permission escalation as described here: https://gitlab.com/gitlab-org/gitlab-ci/issues/225

As this is security fix this commit should be cherry-picked to 7.13: https://dev.gitlab.org/gitlab/gitlab-ci/commit/02982e545744925a6ce8238ed354abdd8e6c835f


See merge request !165

Replaced .show and .hide with .removeClass('hide') and .addClass('hide') (Like done for #192 in MR 177)

- check if user has manage access to project
- don't cache result of authorized_projects, because it's serialised with User object
- clear user sessions

Update CI documentation to include complete YAML syntax, Docker features and use of Variables covered

/cc @JobV @sytses 

See merge request !205

Rework CI documentation by adding informations about YAML, the use of Docker images and building them

fix small spelling issue in CONTRIBUTING.md

Fix mispelling of 'submission' in contributing doc.

See merge request !201

Point to correct GitLab CI url.

See merge request !202

Fix upgrader version detection

This ports changes from the gitlab upgrader script to gitlabci. With the changes the upgrader script now works correct with versions that contain more than 1 digit.

See merge request !203

- fixes upgrader script not working with v7.1x versions
- rspec test cases from gitlab for upgrader lib
- rename gitlab to gitlabci
- use real data for gitlabci3 version check

Create config/secrets.yml with 0600

See merge request !200

Update install and update documentation for 7.13

@JobV Please push directly to this branch and merge if ok.

See merge request !199