Added WindowsRegistry class

Source: http://code.activestate.com/recipes/146305-windows-registry-for-dummies/
Add initial registry read flag; Attempt to use WindowsRegistry class...
Some improvements to WindowsRegistry class

Added unit tests
Fix WindowsRegistry class tests & access rights

 - Now tries rights in order of decreasing access level

 - Renamed "write" parameter to "create"

 - Added delval() and del_subkey() methods

 - Cleanup registry after doctests
Fix WindowsRegistry to fail gracefully if no write access

 - Make _winreg Data Types accessible as class constants
 - Make RIGHTSDICT and RIGHTS_WRITABLE class constants
 - Added self.can_write attribute
Get Windows Registry Input/Output working!
Fail much more gracefully without write access rights
Merge branch 'add-windows-registry-io'

Conflicts:
	vncpasswd.py
Updated README; Add misc. metadata