Various changes related to Python 2.6 deprecation
Various changes related to Python 2.6 deprecation

 - fix link to python.org os.close() doc
 - Remove incorrect note about bytestring names being unsupported
 - add paragraph directing users of older Pythons to version 0.9.9
 - change supported range to 2.7 - 3.x

overcastcloud/posix_ipc,overcastcloud/posix_ipc,overcastcloud/posix_ipc,overcastcloud/posix_ipc