font resize problem

On the Nexus 7 virtual device, the menu choices to make the font smaller instead made the font larger. While debugging and stepping through the code I saw that the text size returned on line 109 of ```NoteEdit.java``` increased over successive selections of the "Smaller" menu option - the opposite of what it should have done, but that explained the visual change that I was seeing on screen.

I found that this behavior was fixed with a change to the ```setTextSize()``` call on line 111 to explicitly set the unit of change.