add a RoundedRectangle instruction

example usage: https://gist.github.com/9457555
core:Clipboard ensure clipboard works on older android versions.
Merge pull request #1947 from kivy/clipboard_2.3

core:Clipboard ensure clipboard works on older android versions.
Merge pull request #1946 from kivy/rounded_rectangle_instruction

add a RoundedRectangle instruction
Fix displaying logs on debug level by default (#1940)
Merge branch 'master' of https://github.com/kivy/kivy into 1940-logger-levels
Merge pull request #1948 from mihaineacsu/1940-logger-levels

Logger levels