Documentation fixes

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-136 into branch/default

Created originally on Bitbucket by chrish42 (Christian Hudon)

Was already merged in Bitbucket before import, marked as merged by the import user

Source changeset not longer availableat the time of import. Commit listwill look empty

Documentation fixes after going through said doc during PyCon 2013 sprint.

  • mention that Pygame and Graphviz should be the CPython ones
  • recommend cffi over ctypes or Cython
  • mention RPython in more titles
  • stackless support is not deprecated (anymore)
  • progress on getting JIT for ARMv7.

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