Added a coverage script to the package.json file.

- Having a coverage script will make it easier for contributors
- Still requires contributors to have istanbul already installed
Added a coverage script to the package.json file.

- Having a coverage script will make it easier for contributors
- Still requires contributors to have istanbul already installed
Merge branch 'master' of github.com:djensen47/restify-mongoose

Conflicts:
	package.json
Merge pull request #7 from djensen47/master

Added a coverage script to the package.json file.