Python 3.x support among Python 2.7/2.8#22

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ya-mouse wants to merge 7 commits intowallix:masterfrom

ya-mouse:master

Commits on Dec 5, 2013

fix issue with channel closing
casa87
committed

Commits on Apr 14, 2014

support keepalives

SteveAyre
authored and
Anton D. Kachalov
committed
fix varname

SteveAyre
authored and
Anton D. Kachalov
committed

Commits on Apr 21, 2014

Compile ext for python3.x
Anton D. Kachalov
committed
Compile pyssh2 within python3.x and python2.7
Anton D. Kachalov
committed
Remove executable bit
Anton D. Kachalov
committed
Make examples compatible with Python3.x
Anton D. Kachalov
committed