More tests and 100% coverage achievements!

Also fixed a few minor bugs and reworked Browser class to not use the constant
UNIT_TESTING so I could get the class to 100% coverage. Adds a dependency of
testing_helpers which I believe is available on Travis CI by default. Up to 75%
coverage, w00t w00t!

classes/Config.php

@@ -53,7 +53,11 @@ class Config extends Object
 		if (file_exists($filename) && is_file($filename) && is_readable($filename))
 		{
 			require_once $filename;
+		}
 
+		// Checks that we have the config array
+		if (isset($config))
+		{
 			// Determines the environment
 			if (isset($config['environment']))
 			{