Take 2: Remove FAQ-type questions from module docstring
Move xrange and super to future.features

Also rename modules to newrange and newsuper.
Pull newrange out of common_iterators. xrange by default.
PEP8 class name in docstring
Finish refactoring super and xrange
Refactor xrange and magicsuper derivatives; add more tests

- Move xrange and super to future.features.
- Rename modules to newrange and newsuper.
- Reset common_iterators to using xrange by default.

- Also add some end-to-end tests for using 2to3 to migrate Py2 code to Py3
  using 2to3 and running the resulting code under *Python 2* with the future
  module
Fix test for new super() function

Also add PEP8 class name in docstring
Merge branch 'work'
Add requirements.txt specifying ``six``
Simplify tests' directory structure