Upgrade to date-utils@1.2.16.

Allows `rel` to be installed on Windows.
Add mocha@2.0.1.
Add chai@1.9.2.
Convert all test cases to use mocha and chai.
Run tests on `npm test`.
Remove vows dependency.
Add a travis configuration file.
Update to latest coffee-script.
Drop the runtime dependency on CoffeeScript.

* Move all source code from `lib` over to `src`.
* Adds a `prepublish` script to `package.json` that compiles all
  CoffeeScript files from the `src` to the `lib` folder.
* Add `src` and `vows` folders to `.npmignore`.
* Add `lib` to `.gitignore`.

Tests continue to use the CoffeeScript sources, to ensure that always the
latest code is tested.
Move the root `rel.coffee` into the src folder.
Merge branch 'arthur/move-to-mocha'

Conflicts:
	package.json
	vows/test-delete-manager.coffee
	vows/test-table.coffee