Fix compose() to have a less surprising API

[gaearon]

This fixes the embarrassing mishap that compose() API was.
As suggested by @jlongster, now it is a proper compose() you'd find in Lodash or Underscore:

it('composes from right to left', () => {
  const double = x => x * 2;
  const square = x => x * x;
  expect(compose(square)(5)).toBe(25);
  expect(compose(square, double)(5)).toBe(100);
  expect(compose(double, square, double)(5)).toBe(200);
});

In terms of usage, if your code looked like this:

const finalCreateStore = compose(
  applyMiddleware(stuff),
  devTools(),
  somethingElse(),
  createStore
);

It will now look like this:

const finalCreateStore = compose(
  applyMiddleware(stuff),
  devTools(),
  somethingElse()
)(createStore);

This is a breaking change, and thus goes on wip-2.0 branch.