Updates to the list of files to in- or ex-clude in the package.

* Don't include `compose.phar`;
* Don't include the `RELEASE-LIST.md`;
* Do include documentation.

Fixes #304
Work around npm- and bower-version forcing git commit.
Merge branch 'feature/package-docs' into develop
Committing minifed payloads.
Marionette shouldn't throw an error for missing layers.

It should also return `null` not `undefined`, according to the docs.