chore(docs-app): add debounce to search input

This fixes issues where the search results do not correctly reflect
the search query. This happens in Firefox when you enter a search query
very rapidly.
There is probably an issue with the async behavior of the search / webworker,
so this is just a workaround.

Author: Narretz

docs/config/templates/app/indexPage.template.html

@@ -83,6 +83,7 @@ <h1 class="brand"><a href="http://angularjs.org"><img width="117" height="30" sr
                  ng-blur="focus=false"
                  ng-change="search(q)"
                  ng-model="q"
+                 ng-model-options="{debounce: 150}"
                  docs-search-input
                  autocomplete="off">
             </form>