Add specs for checksum results
Revert "Accept an IO instead of a path in SandboxUploader#upload"

This reverts commit cf984bf858ed8e68ec47b985faef2671687d46dc.

Conflicts:
	lib/ridley/sandbox_uploader.rb
Merge pull request #75 from RiotGames/409-signature-mismatch

Fix signature mismatches during sandbox upload