Change bower.main attribute to single angular-kendo artifact

Change bower.main attribute to single angular-kendo artifact instead wildcard.

Problem: 
Plugins like [grunt-bower-install](https://npmjs.org/package/grunt-bower-install) could automatically create script elements with bower components.
They are using the main attribute of the bower.json of each component and injecting them into the given html file.
With a wildcard at this point in this project, the angular-kendo would be injected two times.

Minification should be done by the final build process, during the development the not minified version should be used for e.g. debugging.