Codeception improvements

A more full featured codeception plugin. Parses the XML return from codeception test results and uses some of them in the display. Stores all of them in the meta table.

![What it looks like](https://cloud.githubusercontent.com/assets/400210/4204488/cc33fc12-3837-11e4-83be-3dc76036ce48.png)

As part of #673 - A lot of the UI Plugins now hide themselves when they have no data. Please could you carry that across to your plugin?