Almost working circle vanish
Circles vanish and appear as expected 

There's a bit of a fudge going on but it'll do for now
Create and use CircleBrush  class
Add .gitignore
Break CircleArea out to its own file
Update layout file + strings
Modify default brush colour
Removed unused view class
Remove unused/commented code
Finish replacing Paint with CircleBrush
Minor tweaks
Improve TextView placement
Modified felt background
Replacement felt background
Layout tweaks
Update chooser layout
Don't die at app start
Set debug message visibility based on debugEnabled
Change default brush colour
Show/hide timer view appropriately