Added more information to api calls
Prevent a NPE when updating invalid HeadSigns
Filter out 0.00 prices from Buysigns
Reorder checks in if statement
Added /buy verify command
Added /buy expire command
Change verify/expire commands to use the 'payload' key
Moved verify/expire commands to /buycraft
Fixed random tabs

They were annoying me. So I killed them. >:D
Added support for deletion of commands via command id's
Kill all the tabs!!
Make sure new command deletion tasks are allowed to be scheduled
Add support for checking free inventory slots before command execution

Check occurs right before command execution. If the player does not have
the required inventory slots the command is ignored and is run next time
the package checker is run.
Only send one message to the user for inventory checks
Merge pull request #16 from ShadowDog007/master

New stuffz