construct a QUrl using addQueryItem()
include cleanup
no need to adjust LIBS and INCLUDES for declarative cache usage
compile with organizer features on any platform
make building for a certain platform explicit

* allows to compile e.g. the QML versions w/o having to change sources
make compiling with MDeclarativeCache optional

* allows to compile QML versions on the desktop w/o having to build the declarative booster or having to change sources
actually append to string
Merge pull request #46 from shentok/cleanup

Tweak build system for compiling different variants on the deskop