Ignite: Add more fields to generated plugins

[jamonholmgren]

Generated plugins should also include description, license, devDependencies in their generated package.json.

[skellock]

Heads up; devDependencies are optional. I could be convinced of peer dependencies, but we decided not to for now.

edit: if you're talking about ignite.

[jamonholmgren]

We should also add author, url, and also add a sample README.md file.

[GantMan]

also the generated file has blah.js instead of blah.js.ejs for examples

[jamonholmgren]

@robinheinze Could you fix these things in Ignite?

[robinheinze]

Working on this now.