A feature release, which introduces the following changes:

• It is now possible to use vector drawables for the navigation icon of a TabSwitcher's toolbar as well as for the icon and close button icon of tabs (even on pre-Lollipop devices).
• Updated AppCompat v7 support library to version 27.1.1
• Updated AppCompat annotations support library to version 27.1.1
• Updated dependency "AndroidUtil" to version 1.20.3.
• Updated dependency "AndroidMaterialViews" to version 2.1.11.