Update devel/py-Spans to 1.0.0.  Changes since 0.5.0:

Added NotImplemented for << and >> operators when there is a type mismatch
Added | operator for unions of Range and NotImplemented support for RangeSet
Added & operator for intersections of Range and NotImplemented support for RangeSet
Added - operator for differences of Range and NotImplemented support for RangeSet
Added reversed() iterator support for DiscreteRange
Fixed overlap with empty range incorrectly returns True (bug #7)
Fixed issue with contains() for scalars on unbounded ranges
Fixed type check for right_of()
Fixed type check for contains()
Fixed type check for union()
Fixed type check for intersection()
Fixed type check for difference()
Fixed infinite iterators not being supported for DiscreteRange

(gson)