Initial commit of the python meterpreter.
Add process enumeration for windows.
Add Windows registry manipulation support.
Improve process execution on Linux.
Add process enumeration via PS for OSX.
Remove debug print and fix channel additions.
Sort import statements alphabetically.
Merge remote-tracking branch 'upstream/master' into python-meterpreter-dev
Un typo a client and server socket mixup.
Always os.fork() when available.
Add module for ZDI-13-207
Fix typo
Land #2305 - HP LoadRunner lrFileIOService ActiveX WriteFileString Bug
Lands #2244 Python Meterpreter

[Closes #2244]