return a new function for each getter

- defines the getters onto a proto
- the function returned has its __proto__ set to our proto

fixes #32

test.js

@@ -32,6 +32,17 @@ describe('chalk', function () {
 		assert.equal(chalk.reset(chalk.red.bgGreen.underline('foo') + 'foo'), '\u001b[0m\u001b[4m\u001b[42m\u001b[31mfoo\u001b[39m\u001b[49m\u001b[24mfoo\u001b[0m');
 	});
 
+	it('should be able to cache multiple styles', function() {
+		var red = chalk.red;
+		var blue = chalk.blue;
+		var redBold = red.bold;
+		var blueBold = blue.bold;
+
+		assert.notEqual(red('foo'), blue('foo'));
+		assert.notEqual(redBold('bar'), blueBold('bar'));
+		assert.notEqual(blue('baz'), blueBold('baz'));
+	});
+
 	it('should alias gray to grey', function () {
 		assert.equal(chalk.grey('foo'), '\u001b[90mfoo\u001b[39m');
 	});