Refs #5800, add namespaces to integration tests in root folder. Also add IntegrationTestCase to a namespace, re-add individual test @groups, move test groups to class level, and rename test files & class names so underscores are not used.
add travis_retry to prevent random build failure
eg. https://travis-ci.org/piwik/piwik/jobs/29180844
trying to prevent random build failure eg. https://travis-ci.org/piwik/piwik/jobs/29502366
Refs #5273 Replace Trac ticket URL to Github
Refs #5273 Replace other Trac URLs with Github URLs
Removed this string from otrance
Updating UI test module.
Updating UI tests.
Merge branch 'master' into manipulator_refactor

Conflicts:
	tests/PHPUnit/Integration/ApiGetReportMetadataTest.php
	tests/PHPUnit/Integration/FlattenReportsTest.php
	tests/PHPUnit/Integration/OneVisitorTwoVisitsTest.php
	tests/PHPUnit/Integration/RowEvolutionTest.php
Remove use of generic filter from Visualization to see if UI tests pass.