Different config examples for NPM usage

The config examples given didn't work for me, but these did -- feel free to merge if this seems generally useful.
Clarify intention to provide a sample `webpack.config.js` to get started with NPM version of config
Merge pull request #5 from harlantwood/patch-1

Different config examples for NPM usage
added process.cwd() for better NPM compatability and removed automatic entries - you now have to specify entries manually
0.9.0 -- see changelog
bugfix in webpack-cordova-plugin
another bugfix for webpack-cordova-plugin