Changes since 0.2.0:
+ Renamed Interval.__add__ to Interval.join
* Changed parameter names for Interval.__init__ and added default values
* Changed BaseIntervalSet.__contains__ so that it no longer does a subset
  test
* Modified BaseIntervalSet.__issubset__ so that it only operates on other
  BaseIntervalSets
* Modified IntervalSet.remove so that it only removes intervals, sets, or
  discrete values
* Modified IntervalSet.update so that it operates on another BaseIntervalSet
  operand only
* Modified IntervalSet.intersection_update so that it operates on another
  BaseIntervalSet operand only
* Modified IntervalSet.difference_update so that it only operates with a
  BaseIntervalSet instance
* Modified IntervalSet.symmetric_difference_update so that it uses only
  IntervalSets as operands
* Modified add so that it no longer recursively adds IntervalSets
* Modified remove so that it no longer recursively removes IntervalSets
* Modified | and + so that only IntervalSet operands are used
* Modified symmetric_difference so it operates on IntervalSets only
* Modified union so it only operates on IntervalSets
* Modified & and intersection so they only operates on IntervalSets
* Modified - so it only operates on IntervalSets
* Modified ^ so it only operates on IntervalSets
+ Added BaseIntervalSet support for len(s).  It returns the number of
  intervals in the BaseIntervalSet.
* Modified BaseIntervalSet.__init__ to take an iterable object instead of an
  arbitrary number of arguments
* Modified union, intersection, difference, symmetric_difference, issubset,
  and issuperset to accept any iterable object
* Modified update, intersection_update, difference_update, and 
  symmetric_difference_update to accept any iterable object
* Fixed bug where a < b and b > a returns true if a == b

Changes since 0.1:
* iset module was renamed to interval
* ISet class was renamed to IntervalSet
+ Added BaseIntervalSet and FrozenIntervalSet
+ Added the Smallest and Largest classes
+ Added the constant inf
* Moved ne, lt, le, gt, ge, incInterval, exInterval, and between to 
  better-named class methods
* Moved all and empty to classmethods in BaseIntervalSet
- Removed eq
+ Added all as classmethod to Interval
- Removed Interval.__cmp__
+ Added Interval.comesBefore
* Renamed Interval.lbound to Interval.min
* Renamed Interval.linc to Interval.mininc
* Renamed Interval.ubound to Interval.max
* Renamed Interval.uinc to Interval.maxinc
+ Added __hash__ functions
+ Added BaseIntervalSet.__lt__
+ Added BaseIntervalSet.issubset
+ Added BaseIntervalSet.issuperset
+ Added BaseIntervalSet.union
+ Added BaseIntervalSet.intersection
+ Added BaseIntervalSet.difference
+ Added BaseIntervalSet.symmetric_difference
+ Added BaseIntervalSet.copy
+ Added IntervalSet.update
+ Added IntervalSet.intersection_update
+ Added IntervalSet.difference_update
+ Added IntervalSet.symmetric_difference_update
+ Added IntervalSet.discard
+ Added IntervalSet.pop
+ Added IntervalSet.__iter__
+ Added IntervalSet.clear
* Renamed IntervalSet.append to IntervalSet.add
+ Added IntervalSet.remove