Support installing packages for alternative repositories

[rvagg]

npm is a great fit for Ender but I know a lot of people are very uncomfortable with it for front-end packages. There's also a few alternative front-end repositories popping up that we could consider supporting.

1.0-wip has all the repo code abstracted into repository.js so in theory it wouldn't be too hard to add support for additional repositories. The reliance on the node_modules directory and packages.json might be a bit of an issue though, although most of that logic is fairly well partitioned too.

The new Bower from Twitter is the first logical target and I've been looking into that, Jam is another. Volo could be considered too but I'm not sure it has a particularly bright future.

Thoughts on how to support alternative repositories:

• --repository npm|bower|jam|volo command line argument, with npm being the default.
• add a repository designator to the package names, so you might do something like: ender build npm:underscore bower:jquery bower:bootstrap. Though, mixing repositories in a single build may be problematic, particularly when it comes to dependency resolution and duplication (perhaps it's just a case of caveat emptor?).

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