some stability fixes

• Due:14/Oct/13

Key	Summary	Updated
MCPE-3159	It does not say "Stone Slab"	2013-06-06T16-02 21/Jul/14
MCPE-4142	While using chat box and get damage, the chat box will lose and the keyboard not disappear.	2013-06-09T16-10 21/Jul/14

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