Fixes #4878, re-introduce VisitFrequency Archiver in order to successfully combine pre-2.0 VisitFrequency data with new data.
Fix: window.back() does not exist!

Uncaught TypeError: Object [object global] has no method 'back' 
--> window.history.back()
refs #4903 removed no longer needed methods, make sure logger uses correct log level in case logger instance was already created, if the test proxy is used do not go two directories upwards
refs #4903 log if we resume an already existing queue
refs #4903 forgot to commit this change
refs #4903 added test for web archiving. Added screen to log writers hoping no test fails because of this
Merge pull request #251 from sgreiner/master

Fix: window.back() does not exist!
thanks for the fix!
Merge pull request #249 from piwik/translationupdates

[automatic translation update] Updated 2501 strings in 5 languages (de, es-ar, ja, pl, te)
refs #4903 removing this lock as it does not work anyway. After locking the table the lock will be immediately released when inserting the new archiving id as there is a second get_lock call. According to MySQL and tests have proven it a lock is released when you execute a new GET_LOCK()
refs #4918 remove no longer needed method
Adding missing @group
Merge remote-tracking branch 'origin/master'
Make sure PIWIK_ENABLE_DISPATCH is defined at all times, since it's used in getPiwikUrl() helper
Commit work in progress cc @tsteur
Add 'contains' assert to screenshot testing mechanism.
Updating UI submodule.
Updating UI submodule.
fixes #4854 always allow to add/remove new trusted hosts, even if there is only one defined in config
Add initial command to help w/ managing Integration test files.
Refs #4878, fix nb_uniq_visitors metric issue in VisitFrequency archiving and fix errors in build.