Add list of Python values considered False
Add list of Python values considered False

The list of False values can be used by tests to check if
values are False or True more reliably. If a value is in
FALSE_VALUES it is false and otherwise is true. This will
only work in cases were the values being checked are
constants. This also does not deal with the case where a
user-defined class instance evaluates to false. We couldn't
figure that out anyway.

See https://docs.python.org/2/library/stdtypes.html#truth-value-testing

Change-Id: Ie301287c2516d311487dece0c098a36837f872dd

stackforge/bandit,austin987/bandit,stackforge/bandit,pombredanne/bandit,chair6/bandit,pombredanne/bandit