Adding to MtGox-PHP-API-V2

I am currently working with the ANXBTC exchange's API, which uses MtGox's API.

Added an executedTrades() function to allow the user to look at their transaction history.
Added some print statements to help people debug the functions (ex. printing out the url). 
Changed the URL to be "anxpro" instead of "data.mtgox" because "data.mtgox" no longer exists.