Revert "allow passing pre-downloaded file path to source()". Closes #46
Revert "allow passing pre-downloaded file path to source()". Closes #46

This reverts commit 77c1c03d0cd007ba72b0364d9579f4d9a6d36203.

Conflicts:

	lib/sprinkle/installers/source.rb

sprinkle-tool/sprinkle,sprinkle-tool/sprinkle,crafterm/sprinkle