fix errors in errorHandler

[Schlaefer]

• fix error if stack-trace has no class information, use function information instead if available
• fix double space in method arguments output

[Schlaefer]

Travis failed with an deployment error, but the code is fine.

To reproduce throw an exception e.g. in a Plugin.php

public function on($eventKey, $data = null) {
  throw new \Exception;
  // ...   
}

and you'll trigger that error in the development error handler:

Notice: Undefined index: class in …/plugins/phile/errorHandler/Classes/Development.php on line 93

If nobody objects I'll merge in the coming days.