Leverage Bower javascript package manager

Any interest in using a proper package manager rather than submodules? I think bower is the simplest, plus sjcl is already using it -- just needs a small update:
https://github.com/bitwiseshiftleft/sjcl/pull/100

This would also help mailveloper better manage its dependencies, among other users:
https://github.com/toberndo/mailvelope

Let me know if you're interested, and I'd be happy to submit a PR

cc: @toberndo