Add Qt 5.2.1 changelog

Change-Id: I0390aa8ff05270a8b6fe63e729b3f45dcc05275e
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Updated the list of examples tagged for Android

Tested the examples that are tagged for
user experience and relevance for mobile devices, and
updated the list accordingly.

Task-number: QTBUG-34805
Change-Id: I1ccd23fa626deb42c0fea4e03a2bf7a8dd2a856c
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>