gcloud skin for docs

Staged [here](http://silvolu.github.io/gcloud-python/).
For now I removed the datastore-getting-started and storage-getting-started from the docset because I think they are a bit redundant and I'm not sure they should be in the reference. The sources are still in `_components` though.
It is to avoid the dreaded [title level inconsisten](http://stackoverflow.com/questions/24504301/what-does-title-level-inconsistent-mean), and also when converted to html produces the level of heading that I need :)