Rx.Internals renamed to internals;
Added Rx.config module.
Promises was moved from rx.async.d.ts to rx.d.ts.
Fixed definition for Rx.config.Promise;
Added test for promises;
Added Observable.fromGenerator method.
Added overloads of concat and merge taking promises instead of observables.
Added overloads of `selectMany`/`flatMap` taking promises instead of observables.
Rx-Async: version bump to 2.2.15; added `ObservableStatic.startAsync`.
Rx-Async: added test for `startAsync`.
Fixed headers of RxJS-Async and RxJS-Time.
Added new `RxJS-BackPressure` module defintion.
Fixed .gitignore to exclude rx.js from ignoring.
RxJS-BackPressure: added tests.