added .git to travis submodule dependency

Merge master to 3.x-dev

Fix for issue 10427 - Tk should equal N not 1

Moved UI screenshots inside the repository using git-lfs

* remove some deprecated events

* fix unit tests wants to establish a DB connection, read it from cache

* fix possible bug

* fix some integration tests

* fix tests

* fix category was not set

* fix some tests

* fix integration test

* trying to fix pivot tests

* add new events

* update submodule

API.getReportMetadata should only work with one idSite 

Merge master => 3.x-dev

[skip ci]

Conflicts:
	js/piwik.min.js
	piwik.js