Lua : Add initial testing config

This sets Lua up for some unit testing.  We won't have an event loop
based timer, so we'll drop that from Test.hx.

tests/unit/compile-lua.hxml

@@ -0,0 +1,3 @@
+compile-each.hxml
+unit.Test
+-lua bin/unit.lua

tests/unit/src/unit/Test.hx

@@ -252,7 +252,7 @@ class Test {
 	}
 
 	static function resetTimer() {
-		#if (neko || php || cpp || java || cs || python || hl)
+		#if (neko || php || cpp || java || cs || python || hl || lua)
 		#else
 		if( timer != null ) timer.stop();
 		timer = new haxe.Timer(30000);