block currencies

2-21-13
I added the 4 block currencies in HomeWorldPlugin.java
and I believe I have the deposit all feature done, though I don't know how to test it

2-22-13
I added withdrawAll, depositAll, and methods for each that piece up the code nicely. I also updated the command handler to accept "all" as an argument for each. /withdraw all will get as much of the most expensive items, then the most least expensive all the way down. /withdraw [currency] all will get as much of the currency as possible. deposit all is the same. I did not include the boolean for interest of modularity, nor did I make a /deposit all option to deposit any and all currency in your inventory.