Merge pull request #1 from gokrokvertskhov/master

Added basic EC2 support
Fix on Windows network adapter selection
Support for Windows 2003 and 2003 R2
Fix to set Powershell's ExecutionPolicy in session

Avoids setting the policy in the registry
Added support for post metadata encrypted password
Bug fix
Utils refactoring
Bug fixes
Refactoring
Minor refactoring in exception handling
Added can_post_password
Added retry_count option
Moved HttpService up due to post password support