Add the MBAPrereqSupportPackage attribute to all package types so that more than one package can be installed by the Prereq BA.
Rename the MBAPrereqSupportPackage attribute to PrereqSupportPackage, the WixMBAPrereqSupportPackage table to MbaPrerequisiteSupportPackage, and respect the InstallCondition on the MbaPrereqPackage if the new attribute is set.
Merge pull request #30 from rseanhall/feat4161

Conflicts:
	History.md