Mean cli

Currently, the `meanio` npm package pulls double duty - as the cli interface for mean, as well as extracted functionality for linnovate/mean. `meanio` must be installed both globally and for each install of mean. This is confusing to some users. To make matters worse, the npm package is called `meanio` while the Github repo is named `mean-cli`.

A new npm module has already been created for testing purposes. Need to decide on versioning (currently 0.0.4, but could be brought inline with current `0.6.7` on `meanio`.
Also, a new Github repo was set up as [linnovate/meanio](https://github.com/linnovate/meanio).

Still need to update documentation for installing mean. Additional PRs coming to [linnovate/mean](https://github.com/linnovate/mean) and [linnovate/meansite](https://github.com/linnovate/meansite) repos.