bumping version in master to 3.1
more details for cdnjs publishing
[BUG #7590] qx.Mobile form label has no own color in custom theme
[BUG #7587] Fixed slider rendering in the simple and indigo theme.
minor lint fix
removed unused variable
minor fix
[BUG #7599] Hotfix: Flush the element queue only; skip failing tests in IE
[Bug #7600] Applies now the default font styles to the cell which was set in constructor time even if no condition was defined. Some documentation improvements made.
fixed dynamic theme switch
Code formatting styles.css of qx.Mobile Showcase
[BUG #7595] Carousel page transition should adapt the swipe velocity
[BUG #7599] fixed typo
Optimizing the qx.Mobile Dialog showcase.

* Reorder the buttons for opening the popup showcase.
Refactoring qx.Mobile Showcase: Dialog
Improved rendering performance of qx.Mobile Picker on iOS devices.
[BUG #7605] Picker slot rendering performance should be improved
Provided an example for a DatePicker.
Preventing flickering of gestureTargets in qx.Mobile Showcase "Events" page
Refactoring qx.Mobile Maps example.

* Refactoring "zoomToPosition" method