Python 2 and 3 with the same source!

* Fixes Python 3 compatibility issues so one codebase will work for
  python 2.6, 2.7, 3.2 and 3.3.
* Adds six dependency.
* Also adds python wheels support to the build/release fab script (#234)
Removes commented out code
Moves six usages to SoftLayer/utils.py to avoid E1101 errors
Renames SoftLayer.utils.input to console_input
Added support for specifying a post-install script when provisioning a server. Closes #199
Merge pull request #269 from beittenc/server_postinstall_script

Added support for specifying a post-install script when provisioning a server
Fixes Message queue CLI module stdin semantics
Merge pull request #239 from sudorandom/no2to3

Python 2 and 3 with the same source!
Merge pull request #270 from sudorandom/messaging-stdin

Fixes Message queue CLI module stdin semantics