added a --download and -d shorthand switch to download the raw paste files from a public scrape.
i need to check to make sure that it is the correct way to do it, and also check to see if a filename exists already.
this will prevent duplicate files from being downloaded.
added
-- raw
-- scrape_public_pastes
-- list_trending (still broken though. need to fix the api call)
-- added a method to extract just the keys from public pastes
-- moved the previous tests to an examples.rb file
need to mess around with all the different ways to parse arguments for the
command line program.
