Selecting a branch is dangerous now that we have rc in a branch.
Change it earlier as well.
Merge branch 'select-a-tag' into 'master'

Select a tag

Related to #1603.

Prevent users looking to install GitLab from source from installing a release candidate by mistake.

See merge request !1274
added office analogy to help understanding of gitlab architecture
replaced hotlink
remove unnecessarry image
Merge branch 'office_analogy' into 'master'

Office analogy

introduced office analogy to architecture.md

See merge request !1275
Add Dockerfile to build an Omnibus GitLab image
Merge branch 'master' into 'master'

Add Dockerfile to build an Omnibus GitLab image

See merge request !244
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce