add command line interface
add cli card and set commands to readme
enable piping truncated output
Merge pull request #46 from davidchambers/cli

Command-line Interface
various fixes and tweaks relating to #46

  - rename command_line.coffee
  - rebuild command.js using the correct CoffeeScript version
  - fix regular expression in formatters.coffee
  - fix stylistic inconsistencies
  - remove language directive from "code" block in CLI documentation
  - replace "tutor.js" with "tutor" in CLI documentation
merged upstream/master in following upstream's merge of original CLI implementation