This adds API V3 endpoints for querying, creating, modifying and
deleting environment variables.
It has no concept of encryption yet and should be considered a work in
progress.
We should also talk about the slightly off-track approach in the
EnvVars::Create service – maybe there's a way to standardise the
querying and rendering for post requests?
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This adds /repo/{repository.id}/settings endpoints for reading
and updating repo settings.
Main points:
1. Sets up Settings as a first class resource instead of as an
attribute of Repository
2. Adds new meta-programmed method to Query for accessing all
prefixed params as a hash.
