fixes #2 fixes #3 update code sample to work with Ionic v2 beta 3

[rtpHarry]

This updates all the changes between beta 1 and beta 3 like updated dependencies, the switch from webpack to gulp, updated package names, changed config file formats and extra imports required.

This should solve issues #2 and #3 as they describe what I was experiencing when I first did the ionic serve with this against beta 3.

[lenin-indigo]

With your changes it gives me the the next error:

$ ionic serve
....
node_modules\ionic-angular\components.core.scss
Error: Import directives may not be used within control directives or mixins.
        on line 31 of node_modules/ionic-angular/components.core.scss
>>   @import "fonts/ionicons";
   --^
....

And in the console:

Failed to load resource: the server responded with a status of 404 (Not Found) http://localhost:8100/build/css/app.ios.css