Add a warning if package name already exists on npm
Merge pull request #22 from zenorocha/warning-pkg-name

Add a warning if package name already exists on npm
Update package.json template

1. add author url
2. licenses type ref: https://www.npmjs.org/doc/json.html#license
Merge pull request #23 from huei90/patch-1

Update package.json template
Rename `licenses` to the proper, singular form.

RE: #23
0.0.8