Automate builds with target moniker ranges

[gbakeman]

I'm creating this issue from our discussion in the Gitter chat room, since I believe @haf thinks there's a possibility Albacore could do more when it comes to building for multiple targets/platforms.

I'm saying that since albacore is a build system it could 'know' how to switch that target moniker by itself. The current configuration is good as is; it builds for a given target. Now perhaps there's a need for something orchestrating what exists?
Something that can iterate through the monikers and ensure the settings are OK?

Perhaps having a feature like this might simplify Rakefiles when it comes to building for multiple platforms.