fixed spec helper (wasn't actually using input) and added two-set helper
wrote #destroy method and tests
added line break in spec file for readability
updated #destroy method with method hack and updated specs
added play helpers
changed urls to vidnums throughout (hopefully added everything)
small tweaks to sinatra.rb, minor edits to spec (error checking for shared examples)
added #play method and tests
cleaned up all specs, minor fixes in sinatra.rb, hopefully good to go :-)