Source and install_option parameter for package agent

This patch will add support for "source" and "install_options" parameter to package agent. With those options you will be able to install windows packages.

mco example:
% mco rpc package install package="Some Software" source="c:\path\to\some-software-1.0.msi" install_options="{ 'TARGET' => 'C:\\' }" -F kernel=windows