Support :repositories key in quoted project map

[emlyn]

To allow use of dependencies that are not in the default repositories

[hypirion]

Yeah, I want to support this fairly quickly, as I need it myself.

However, for credentials-protected repos, I'd like to not insert credentials or how the credentials are resolved directly into the scripts. The repo itself is fine, but credentials and the like should probably reside in ~/.inlein/config.clj or something similar.

[coreagile]

I also need this. We use private repositories to store our artifacts, and even worse, we use S3 to store our artifacts (using the s3-wagon plugin in leiningen). That would make this so useful for us!