Switched cards.csv to a JSON file.

The JSON file is taken from hearthstonejson.com  which has been
extracted directly from the game files.  Thus, we no longer have to try and
scrape the data from websites, or enter it ourselves.

Also implemented Piloted Shredder to test a few features.
Added the JSON file to the repository
Merge pull request #12 from danielyule/master

Merge