In travis, if minimum required piwik is greater than current version in master, test against master.

Updated the install css file to fit with the current piwik style

#7001 Improved accessibility with off-screen text added on the menu

Fixing build failure, 4 distinct metrics no longer appear due to bug fix (distinct referrers are 0, so no metric added).

Fixes #7034, correctly compute Referrers distinct metrics by counting array, not DataArray instance (which results in 1 always).

You can now see the focus of menu items when tabbing through the page

fixed engangement screen which was wrong because of a merge and updated submodule to fix more ui tests

When using testmode in RequestCommand make sure the database connection is re-created and the option data cache cleared. Solved issue where normal database was being used for ArchiveCron test.

Fix #6927 race conditions when deleting files