Add directional sticky and skewer box variants

entity.lua

@@ -14,6 +14,8 @@ function Entity:initialize(t)
 	self.name = t.name
 	self.color = Color:new(t.color)
 	self.collision = t.collision --"none", "moveable", "unmoveable"
+	self.sticky = t.sticky or false
+	self.skewer = t.skewer or false
 	self.sprite = repSprite
 	self.shaAmount = t.sha or 1
 	-- onBump is a method (see Entity:onBump) so mixins like Dialogable can
@@ -134,6 +136,14 @@ function Entity:canMove()
 	return false
 end
 
+function Entity:isSticky()
+	return self.sticky
+end
+
+function Entity:isSkewer()
+	return self.skewer
+end
+
 function Entity:canPassOver()
 	if self:getCollision() == "none" then 
 		return true