Comment out broken timer code
Draw "erase" circles
Refactor and tidy
Add felt background
Switch app background
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