Bukkit

Added a 'poison' and a 'cure from poison' effect
Fixed the command effect to propely accept a slash at the beginning of the command
Made timespans available as arguments of commands
Fixed the expressions 'argument-<type>' and '<type> argument'
Added cave spiders

commit: https://github.com/Njol/Skript/commit/e7d57b7f434d8ca3a4be58af8ed6020b0a7d361b

The default location of many block events is at an entity and vice versa. I know the cause but not how to fix this tidily.
The damage in damage events is still the raw damage, i.e. without any armour/critical/enchantment modifidicators applied.

see also: https://github.com/Njol/Skript/issues?labels=bug&page=1&state=open