Correct sort order by using list.sort with support for 'key' and 'reverse'. This method is less efficient, but allows the tests to pass.

Better commented the code, especially the result caching & lazy distribution
list sorting strategies implemented there. Added several TODO comments
indicating things to look into there in the future.

General code cleanup:
 - stopped reusing the project_name variable for different purposes
 - added an assertion to detect corrupt distribution list caches

--HG--
extra : source : 86ef8f59ef4e1fc253c155b9ca0856497455372d

--HG--
extra : source : 32166eed1174dc565d903c81b9d99c292357aecc

--HG--
extra : source : ab82442e2205a4ab1016711e482388590688fa15

Skip this test because it now fails under Python 3.3 and earlier apparently due to a bug in the inspect module. Since the test passes under Python 3.4 and later, that should still serve as a suitable regression test.

Extract the resolution of loader/runner classes. Allows None value to pass-through to unittest.main. Fixes #180.

Allow install to proceed with an egg install on IronPython and any other environment that has no stack support. Fixes #177.

--HG--
extra : amend_source : c92063405d99e7fdb7fe0a6312fa8438c3727c2f

--HG--
extra : amend_source : 829ebde0696d12adfb54aca74ea6b1b510177ff4