add item.has_display

Returns whether the item has a custom display name.
This is to prevent comparing to 'null', and to prevent 'unfilled
attributes' errors.
Added places block event with item in hand context
Fix location clone bug in entity's cursor_on attribute
Merge pull request #524 from Morphan1/master

Add (traits:<trait>|...) to Create command for NPCs.
Merge pull request #522 from mcmonkey4eva/master

add item.has_display
Make custom items work as ingredients in custom recipes, also small tag-fix to <l@location.inventory>
Fix issue with player flag not returning null.
Insert some API for the possibility of denizen auto-registering custom commands. (Still implementing...)
Change dB message scope of unfilled attributes -- now debug instead of error.
Make world events recognize notable inventories.
Add basic meta for reset command.
add matches 'cuboid' to comparable (if ... matches cuboid ...)
Merge pull request #528 from GomaTerzu/master

Make custom items work as ingredients in custom recipes, also small tag-fix to <l@location.inventory>
Add null check for valueOf instead of relying on matches()... gonna be a lot of these!
dMaterial.matches() returns true on any m@ prefixed string
Null check.
Null check.
Improve how custom items work as ingredients in custom recipes
Merge pull request #530 from GomaTerzu/master

Improve how custom items work as ingredients in custom recipes
Merge branch 'master' of https://github.com/aufdemrand/Denizen