So it's a bit of a different story than v1.
With V1, you were just referencing ES5 javascript, not transpiling from es6 or typescript like we're doing in V2.
Plus the additions of modules make things a bit more difficult.
So with v2, it's a bit more difficult to provide a single bundle file. Currently you will need to use npm to download V2 and then webpack (which we've setup for you) to build ionic 2 apps.