Combo environment wrapper implemented; build scripts revised

Closes #21.

I've implemented the proposed "wrapper", based on the wrapper for Q promises.

The build scripts have been revised accordingly, along with `package.json` and `project.clj`.

I tested the Windows build to make sure it's working properly.

In `support/` you'll find some `.html` files and supports scripts which allow spot-checking that `mori` does in fact load properly with a `<script>` tag and as an AMD module.  See the instructions in `support/README.md`.

I also updated the main `README.md`. At this point the `0.2.0-SNAPSHOT` build is diverging significantly from the old build out on the npm registry, so you'll probably want to publish `0.2.0` soon-ish.