Fix issue #10. Fix spatialhash drawing.

Shapes were not inserted into the spatial hash when not moved. Shapes
set to passive directly after creation would not be in the hash,
resulting in no collision reports.

Spatialhash drawing updated to the new cell indexing method.

spatialhash.lua

@@ -37,7 +37,6 @@ end
 -- cells = {[0] = {[0] = <>, [1] = <>, ... }, [1] = {...}, ...}
 local cells_meta = {}
 function cells_meta.__newindex(tbl, key, val)
-	print('newindex')
 	local cell = rawget(tbl, key.x)
 	if not cell then
 		rawset(tbl, key.x, {[key.y] = val})
@@ -82,7 +81,7 @@ function Spatialhash:insert(obj, ul, lr)
 	local lr = self:cellCoords(lr)
 	for i = ul.x,lr.x do
 		for k = ul.y,lr.y do
-			
+			rawset(self.cells[{x=i,y=k}], obj, obj)
 		end
 	end
 end
@@ -108,6 +107,7 @@ end
 
 -- update an objects position
 function Spatialhash:update(obj, ul_old, lr_old, ul_new, lr_new)
+	print('hash:update', obj)
 	local ul_old, lr_old = self:cellCoords(ul_old), self:cellCoords(lr_old)
 	local ul_new, lr_new = self:cellCoords(ul_new), self:cellCoords(lr_new)
 
@@ -146,17 +146,18 @@ end
 
 function Spatialhash:draw(how, show_empty, print_key)
 	if show_empty == nil then show_empty = true end
-	for k,cell in pairs(self.cells) do
+	for k1,v in pairs(self.cells) do
+		for k2,cell in pairs(v) do
 			local empty = true
 			(function() for _ in pairs(cell) do empty = false; return end end)()
 			if show_empty or not empty then
-			local x,y = k:match("([^,]+),([^,]+)")
+				local x = k1 * self.cell_size
-			x = x * self.cell_size
+				local y = k2 * self.cell_size
-			y = y * self.cell_size
+				love.graphics.rectangle(how or 'line', x,y, self.cell_size, self.cell_size)
-			love.graphics.rectangle(how, x,y, self.cell_size, self.cell_size)
 
 				if print_key then
-				love.graphics.print(k, x+3,y+3)
+					love.graphics.print(("%d:%d"):format(k1,k2), x+3,y+3)
+				end
 			end
 		end
 	end