Maintainers and contributors schema - Issue #733

The "maintainers" and "contributors" fields are mostly conformed between the different packages, and only a few are out of step. The schema can be improved to account for these fields, and the non-conforming packages can be easily updated.

See: https://github.com/cdnjs/cdnjs/issues/733

See: http://wiki.commonjs.org/wiki/Packages/1.0

<!---
@huboard:{"order":701.0}
-->