Adds content to README, including some API docs
Adds the rest of the commands in the API docs
Reorganizes text about commands under a better header structure.
Adds information about status, including how to get it and what you get.
Explains that non-strings won't be surrounded by quotes.
Explains what secselapsed does.
Gives credit where credit is due.
Adds "Express" to the README's explanation of what gdPi is.
Fixes quotation marks around status strings
Rephrases the sentence about the status hash
Merge pull request #1 from FrontRush/docs

README and API documentation