Now testing various API exports for ExampleAPI plugins, for all API formats: xml, csv, tsv, json, etc.
Any breaking or modifying change in the renderer or data conversion should trigger a test fail.

Improved parameters in ExampleAPI API.php 
Refs #1446

git-svn-id: http://dev.piwik.org/svn/trunk@2431 59fd770c-687e-43c8-a1e3-f5a4ff64c105