All samples use application style in android manifest instead of system calls in onCreate event now.

(cherry picked from commit bd12f636)
Signed-off-by: Andrey Kamaev <andrey.kamaev@itseez.com>

(cherry picked from commit 47b96407)
Signed-off-by: Andrey Kamaev <andrey.kamaev@itseez.com>

* Added manual port for getTextSize;
* Fixed bugs in "native camera" sample;
* Added 15-puzzle sample.

Android samples fixed - line endings are converted to unix style; autogenerated folders are added to ignore list