Adding repository to package.json

This should remove the _"npm WARN package.json kaapi@0.1.7 No repository field."_ warning during `npm install`, plus make it easier to find the project's repo on npmjs.org and by typing `npm bugs kaapi`.

npm can determine the homepage and bugs URLs from the shorthand repo format, but you can also explicitly add the URLs if you want fewer warnings from http://package-json-validator.com/