gitignore: add missing examples (sound, tablet)

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>

.gitignore

@@ -124,6 +124,7 @@ Makefile
 /examples/scribble/scribble
 /examples/scrollview/scrollview
 /examples/showimg/showimg
+/examples/sound/sound
 /examples/splitter/splitter
 /examples/sql/blob/blob
 /examples/sql/overview/basicbrowsing2/basicbrowsing2
@@ -158,6 +159,9 @@ Makefile
 /examples/table/bigtable/bigtable
 /examples/table/small-table-demo/smalltable
 /examples/table/statistics/statistics
+/examples/tablet/tablet
+/examples/tablet/tabletstatsbase.cpp
+/examples/tablet/tabletstatsbase.h
 /examples/tetrix/tetrix
 /examples/textedit/qmake_image_collection.cpp
 /examples/textedit/textedit