Extend add crate command to take series number.

Also, implement removing of all items from a trade with the remove command.
Cleaned up some of the help messages as well.

Conflicts:
	SteamBot/AdminUserHandler.cs - resolved by hand
Added Crafting, SetGamePlaying() method

All Crafting code is located in Crafting.cs; SetGamePlaying(int id)
allows developers to tell Steam the bot is in game with AppId X (TF2's
is 440)
Fixed MsgCraft's capitalization styling
Merge pull request #279 from cwhelchel/feature/addcrateseries

AdminUserHandler Feature Updates.