Change return value of docsApp.serviceFactory.prepareDefaultAppModule
to include empty array `[]` instead of array containing one empty
string element `['']`.

This will correct script.js for simple plunkr/jsfiddle examples such
as [ngChecked](http://docs.angularjs.org/api/ng.directive:ngChecked).

correct the ordering and make gen-docs prepare the list of versions
during the build process

lunr has been responsible for slowdown in our test suite by adding ~1sec per
end-to-end test.

(this is because it initializes the index when the app starts)

since out test suite primarily tests the examples, it's reasonable do disable
the search as a temporary meansure.

the real fix is to use protractor and extract all of the examples into
standalone apps which can be tested without bootstrapping the whole docs app.