Merge pull request #1 from Gael-de-Sailly/deco_fix

Small fix: add function "table.contains_substring"

valleys_c/deco.lua

@@ -1,4 +1,19 @@
+function table.contains_substring(t, s)
+	if type(s) ~= "string" then
+		return nil
+	end
 
+	for key, value in pairs(t) do
+		if type(value) == 'string' and s:find(value) then
+			if key then
+				return key
+			else
+				return true
+			end
+		end
+	end
+	return false
+end
 
 -- Copy all the decorations except the ones I don't like.
 --  This is currently used to remove the default trees.