'Time on page' column displayed in format MM:SS
Merge branch 'master' of https://github.com/piwik/piwik into time-bugfix
Only show git:commit and git:push command when development mode is on and Git repository is found refs  #6695
Fix unit test after I disabled some tests in 13c730f35381b441b1b02b22e3990f3f5148de59 cc @sgiehl
Fixes  #6696 Prevent this mysql error from occuring during updates - @tsteur will ask user for more info in case there really is a bug
2.9.1
Marking developer changelog as 2.9.1
Add note about new console command core:plugin list
permission fix
Merge branch 'master' of https://github.com/piwik/piwik into time-bugfix
Updating UI test submodule [fix last Installation test].
Update UI tests, fix last Installation test again.
Merge pull request #6689 from Uby501/time-bugfix

Time bugfix
modified test case to allow overriding requests Collection and it's logic
Merge pull request #6709 from mgazdzik/patchApiTesting

modified test case to allow overriding requests Collection and it's logic
Small tweak
Time as HH:MM:SS
synced translations files
do not lose value in case it is an integer or a float. Instead convert it to a string.

Eg this returned the default value in the past: `Common::getRequestVar('param', 'string', 'default', array('param' => 5))` which can happen eg in BulkTracking etc. causing many values not to be tracked. Wondering if it breaks anything.
refs #6697 start refactoring the DoNotTrack code to allow for adding tests