Parse commandline args as separate songs for playlist

[davehouse]

This changes the argument handling to allow for 1+ grouped search terms and handling stdin (pipes not tty) the same as arguments to allow piping in a "playlist" set of search terms and/or song urls.

  cloudruby [--config-args] [(search terms|track urls)]

  # Examples

  cloudruby          # query the latest 100 tracks from soundcloud
  cloudruby $search  # query the latest 100 tracks that match the $search keywords

  ## play a soundcloud url directly
  cloudruby http://soundcloud.com/crassmix/feint-clockwork-hearts-crass

  ## create a playlist from arguments (urls and/or grouped search keywords)
  cloudruby --no-shuffle=true https://soundcloud.com/adapt77/auto-ok-ecophal manicanparty heart "sellorekt thunderbolt" https://soundcloud.com/wearesoundspace/premiere-malbetrieb-ghetto "elektroschneider lenny"
  > search terms are grouped when quoted or adjacent to urls or quoted strings

  ## create a playlist from a pipe
  > stdin is also parsed as arguments if piped into the process
  cloudruby --no-shuffle=true < local-playlist-filename
  printf "sellorekt iris\nmanicanparty eyes" | cloudruby

[davehouse]

The curses ui is not displayed until the searches are complete and the playlist is generated. So, it appears to stall until the searches are compelte. It may be nice to print out the search terms while they are being processed/searched. Or we could change the ui to list a curses window or something showing the status/progress of searches.