Placeholders.
Broke out a download recipe, and then used it to make a pkg recipe.
Switched from Copier to PkgCopier
Changes per @timsutton
Merge pull request #28 from sheagcraig/SilverlightPkg

Silverlight pkg
Keep old 'Silverlight.pkg' naming for Silverlight pkg recipe
Merge remote-tracking branch 'upstream/master'