Display the version number in help and linting output.

[duhrer]

When working with others to test dev releases, it occurred to me that it would be helpful to display the version of fluid-lint-all in the linting output as well as the --help instructions.

I would probably do this by importing the package.json file from the root of the repo and looking at the version property. I could also see displaying the description property as part of the --help output. At the moment it's pretty spare, just USAGE:. It should include the command name and version at least.