Removed some mentions of Recorder and some reorganization. #13462

Change-Id: If147c8d86658490653d93678cc91415c7b5fbaa1
Minor updates to JUnit testing. #13462
Reorganization, Recorder cleanup, ElementQuery API basics, etc. #13462

Change-Id: I74e59322c66921895457037954aa259aa8cd7c1e
Updated TestBench chapter intro graphic, new debug window section, element queries, element classes, web elements, selectors, testing notifications, added some index terms. #13462

Change-Id: Ifcd68fa7f2c22d0c8e2b0c34861c95eb932bbf74
Merge branch 'master' of ssh://dev.vaadin.com:29418/book-of-vaadin into testbench-4.0
TestBench installation, package contents, test case basics, tooltip testing, screenshots of failure. #13462

Change-Id: Id8406be7803e4dcd9014d028709dccdf3ec9ccf9
Merge branch 'testbench-4.0'