Enables code coverage reports using coveralls.io

enable travis to run tests on PHP 5.6 to see if a reported problem only occurs on 5.6. It will be released soon

refs #5970 make sure to reload the same page if user clicks on a date in the evolution chart, even if the metric was changed

refs #4224, #4302 - added code coverage report using coveralls.io

Switch to composer for autoloading. Add Factory base type for factory types that create classes by string ID and fix bug in those classes where exceptions were not thrown on invalid class name (instead a fatal error ocurred).

refs #5989 #6026 let users define a goal depending on an event and fix the examples and condition was not updated when user changes the match_attribute