Update cowlib to 0.5.0

Added support for multipart building and parsing.
Added an include file for doing inline lowercase of binary strings.

src/cowlib.app.src

@@ -14,7 +14,7 @@
 
 {application, cowlib, [
 	{description, "Support library for manipulating Web protocols."},
-	{vsn, "0.4.0"},
+	{vsn, "0.5.0"},
 	{modules, []},
 	{registered, []},
 	{applications, [