Moved demo(s) to examples.

Demos are no longer part of QT_BUILD_PARTS, so any demos must be moved
to examples to be build. So far that means the player demo.

Change-Id: I92641be38accb1c1b723009f1004c63f59ec8266
Reviewed-on: http://codereview.qt.nokia.com/1470
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

examples/examples.pro

@@ -9,7 +9,8 @@ SUBDIRS += \
     audioinput \
     audiooutput \
     videographicsitem \
-    videowidget
+    videowidget \
+    player \
 
 contains(QT_CONFIG, declarative) {
     SUBDIRS += declarative-camera