Clean up remove caddy refs (#139)

* Changed reference to Caddy over to CoreDNS

* Removing references to caddy

* Fixed misleading error message to reference coredns

* Cleaning up references to caddy

* Adding clean and deps targets

Muscle memory is resulting in "make clean" commands.

* Adding test target to makefile

* More "Caddy" cleanup

core/assets/path_test.go

@@ -7,6 +7,6 @@ import (
 
 func TestPath(t *testing.T) {
 	if actual := Path(); !strings.HasSuffix(actual, ".coredns") {
-		t.Errorf("Expected path to be a .caddy folder, got: %v", actual)
+		t.Errorf("Expected path to be a .coredns folder, got: %v", actual)
 	}
 }