Update README and docs

[vojtajina]

• recommend local install (readme, and homepage npm install -g karma)
• minimize readme and rather point to the docs
• recommend karma init
• update plugins and docs - no plugin is shipped with Karma

[dcrockwell]

It seems that in master, the client is now written with browserify. Does this mean the RequireJS mention in the README should be removed or modified?

[vojtajina]

Yep, karma's client code uses CommonJS and browserify. I don't think readme should be changed - you can use Require/CommonJS/whatever you want with Karma.

It's just we use CommonJS to make it the same as the Node.js code...

[dcrockwell]

I apologize. I realized as much after making this post and forgot to delete it. Thank you.