fixed typos

Fixed some typos on doc

See merge request !162

No runner notification can see managers only

https://dev.gitlab.org/gitlab/gitlab-ci/issues/286

See merge request !158

Updated an update and install guides

See merge request !156

Runner without tag should pick builds without tag only

https://dev.gitlab.org/gitlab/gitlab-ci/issues/278

https://gitlab.com/gitlab-org/gitlab-ci/issues/148

https://gitlab.com/gitlab-org/gitlab-ci/issues/172

See merge request !155

Fix: show builds for public users

https://gitlab.com/gitlab-org/gitlab-ci/issues/175

See merge request !154

Yaml refactoring and fixes

This refactoring also fixes some bugs with validation.

https://dev.gitlab.org/gitlab/gitlab-ci/issues/281

See merge request !152

Job to Yaml migrator: `only` section fix

See merge request !150

skip_refs to each jobs

See merge request !149

Added note about [ci skip] to doc

See merge request !148

Update documantation

See merge request !147

Link to webeditor with .gitlab-ci.yml

https://dev.gitlab.org/gitlab/gitlab-ci/issues/265

See merge request !145

Fix API: create project

https://gitlab.com/gitlab-org/gitlab-ci/issues/168

See merge request !144

Rails update to 4.1.11

See merge request !143

Better yaml validation

See merge request !160

Prevent job_id removing

I would prefer to keep field job_id in the builds table. It will allow us much room for manoeuvre.
Of course it is not the best practice to change migration because it can lead to different database states for users but we will remove this filed soon anyway. We will need to put condition there if this field exist.

See merge request !142

Invalid yaml handling

See merge request !159

Invalid yaml handling

See merge request !158

Prevent crash when push new branch with empty commits list

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !139

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>