Feature/indexing (#10)

* [KFI] Following API changes (partial).
* [KFI] Following API changes #2 (partial).
* [KFI] Remove commented out code.
* [KFI] remove QueryExpression field control because it is built on NodeQuery that is not supported anymore.
* [KFI] update NodeQueryXslt proxy to work with content query instead of nodequery.
* [KFI] Use admin settings in content queries when needed.
* [KFI] Upgrade Analyzer configurations in CTDs to the newer, short format.
* [KFI] Remove deprecated classes from warmup type list.
* Update Services references to the latest 7.1.0 version - which is not released yet.
* Remove not used Microsoft.Web.Preview dll reference.
* Raise version number to 7.1.
* Remove or rename Lucene-related method names and texts.
* Update page blobs with the new dll set.
* Add WebPages component class to check component version.
* Fix: WebPages component class is made public so that the system finds it.
* Add missing global search page.