Merge pull request #8 from achiku/master

Add TestSetParamContext to sets ParamHolder for testing

testing.go

@@ -0,0 +1,8 @@
+package xmux
+
+import "golang.org/x/net/context"
+
+// TestSetParamContext sets ParamHolder to context.Context for testing
+func TestSetParamContext(ctx context.Context, p ParamHolder) context.Context {
+	return context.WithValue(ctx, paramsKey, p)
+}