This silences another cron error with duck tape.

Use omnibus-gitlab-runner in GitLab CE example

This updates the runner setup and build script example to use
omnibus-gitlab-runner packages for the GitLab CE tests.

See merge request !102

Better authorization for project access

See merge request !103

For now do this by check if user has access to GitLab project hooks

Fixed builds for specific runners

Bump libv8

This fixes development issues on OS X 10.10. Version 3.16.14.3 is hard
to install for some reason for some people (me).

See merge request !101

Make the schedule_build cron job quiet

As an administrator, it is not interesting for me to get emails from
GitLab CI that look like:

```
.
.
.
.
```

See merge request !100

This fixes development issues on OS X 10.10. Version 3.16.14.3 is hard
to install for some reason for some people (me).

As an administrator, it is not interesting for me to get emails from
GitLab CI that look like:

```
.
.
.
.
```

Update platform requirements

Last_build fix

See merge request !99