language update  refs #3430
Extend tracking with all changes.
Merge pull request #6380 from czolnowski/extend-tracking-code-clean

Let plugins further extend tracking code via Event 'Piwik.getJavascriptCode'
Remove token auth option from core:run-scheduled-tasks command since superuser access now allowed for all commands.
Remove unnecessary UITests testsuite in phpunit.xml.dist file.
Add setSingletonInstance method to Option for testing.
add @ignore so the method does not appear in the auto generated API doc on http://developer.piwik.org/api-reference/classes
Increasing PHP requirements to 5.3.3 refs #6390
When tracker fails, return error code so that it fails the tests.
Merge branch 'master' into translationupdates
Merge branch 'master' into translationupdates
language update  refs #3430
Merge pull request #6391 from piwik/translationupdates

[automatic translation update] Updated 278 strings in 10 languages (pt, cs, da, de, el, es, et, it, pl, ja)
Fixes #6383 Invalidate caches before running the upgrade.
Merge remote-tracking branch 'origin/master'
Simplified code
Added logging in the console when running scheduled tasks
#5300 Prevent email reports from being sent twice for the same period