Merge pull request #24 from TheWeatherCompany/windows-support

add ability to specify "reboot" or not when taking machine image
Merge pull request #25 from TheWeatherCompany/windows-support

new method to get instance password
Added option for allowing NAT instances at launch.
Merge pull request #87 from TheWeatherCompany/SourceDestCheck

Add ability to create a "NAT instance" at launch.