Add new built-in function type() that returns the name of the type of

the given value as a string. Includes test case.

src/main/java/lua/Builtin.java

@@ -21,8 +21,9 @@ final class Builtin extends LFunction {
 	private static final int PAIRS = 1;
 	private static final int GETMETATABLE = 2;
 	private static final int SETMETATABLE = 3;
+	private static final int TYPE = 4;
 	
-	private static final String[] NAMES = { "print", "pairs", "getmetatable", "setmetatable" };
+	private static final String[] NAMES = { "print", "pairs", "getmetatable", "setmetatable", "type" };
 	
 	private static PrintStream stdout = System.out;
 	
@@ -62,6 +63,10 @@ final class Builtin extends LFunction {
 			call.stack[base] = call.stack[base+1];
 			call.top = base+1;
 			break;
+		case TYPE:
+			call.stack[base] = call.stack[base+1].luaGetType();
+			call.top = base+1;
+			break;
 		default:
 			luaUnsupportedOperation();
 		}