Made commands more consistent with Bukkit

In native Bukkit (/give [player] <amount>) and most plugins, the player is put before the amount. It is a simple change, but it will make the plugin easier to use when it follows the rules of most plugins.
Disabled negative input for add/remove

Even though I included this in my last pull request(which was denied), over Skype we discussed it, and you told me that adding/removing should be positive only, to fix the inconsistency between -1 and -2.
Merge pull request #4 from forresthopkinsa/master

Added yet more consistency