Fix build errors described in #64

[mcalthrop]

I finally tracked down 3 changes that need to be made to fix #64:

• bump babel-core and babel-loader to version 6.x
• add babel-preset-es2015 and babel-preset-react modules
• add webpack module

You can now run the following commands to fire up the example code:

$ cd example
$ npm install
$ npm run start

Then point your browser at either of the following URLs:

• localhost:8080
• localhost:8080/webpack-dev-server/

Note that in order for the How to invoke webpack instructions in the README to work, you will additionally have to install webpack globally:

$ npm install -g webpack

[timepast]

good

[mikemfleming]

Works for me too, thanks!

[wenlisu]

Works for me too, thank you very much!