Allow projects to be started from a template
Started implementation for the first iteration of gitlab-org/gitlab-ce#32420. This will allow users to select a template to start with, instead of an empty repository in the project just created. Internally this is basically a small extension of the ImportExport GitLab projects we already support. We just import a certain import tar archive. This commits includes the first one: Ruby on Rails. In the future more will be added.
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