JavaScript improvements for a major release

- Same cordova-js build for all platforms. Use of concepts such as IOC (inversion of control), DI, factory functions, etc. to keep same common JavaScript for all platforms, with limited number of platform-specific functions. I would be happy to explain further if this is not clear enough.
- Cordova JavaScript should initialize the functions, structures, queues, etc. so that application JavaScript does not have to wait for `deviceready` event (already raised in #60). I think this could be an especially major win with frameworks like Angular.

I would be happy to make a demo for discussion, cannot promise when I can make the time.

No files or tests are named. Start by reviewing the related #60 discussion and clarify the proposed common Cordova JavaScript, platform-specific functions, initialization timing, and Angular use case; a concrete design, demo, and agreed scope are needed before implementation can be considered done.

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