Fix path for asset storage (#144)

Define locations for keys and secondary zones, 'n stuff.

Add a bunch of tests as well.

middleware/test/helpers_test.go

@@ -0,0 +1,8 @@
+package test
+
+import "testing"
+
+func TestA(t *testing.T) {
+	// should not crash
+	A("miek.nl. IN A 127.0.0.1")
+}