Whitespace

--HG--
branch : 1.8
Avoid using private attributes.

--HG--
branch : 1.8
Modern style properties.
Code cleanup.
Checkers are crazy. Using format=None and checking for format is None as a way to test whether the caller is a NumberFormat instance is asking for trouble:
n = NumberFormat()
n.is_builtin(None)
True

--HG--
branch : 1.8
Break various style objects out into distinct modules.

--HG--
branch : 1.8
Adjust config for test results history as per instructions from shippable.com

--HG--
branch : 1.8