improve phpspec plugin

This parses the phpspec output and displays a table with error messages that are shown.

All Output of PHP Spec is stored in the Metadata -> meaning we could display more information for the build in the future if wanted.
(is there already some functionality to have expandable tables or something similar to show details?)
You probably also want to make it show if it does have data, like: https://github.com/Block8/PHPCI/blob/dc/new-ui/public/assets/js/build-plugins/phpcs.js#L75