The new ExpectedCondition was added. It combines org.openqa.selenium.support.ui.ExpectedCondition and java.util.function.Function.

Methods `compose` and `andThen` were overridden the way to prevent NPE occurence.

Everything was covered with tests

It was added to allow user to customize gestures in more agile way.
Also:
- the new interface PerformsActions was added. It is implemented by TouchAction and MultiTouchAction.
- The feature was covered with test.