split & rename AskTaskWebtest
new WebTest base class with start() method (navigates to the web app)
Merge branch 'master' of https://github.com/scenarioo/scenarioo-selenium-demo

Conflicts:
	src/test/java/org/scenarioo/mytinytodo/TaskCreationWebtest.java
	src/test/java/org/scenarioo/mytinytodo/TaskListsWebtest.java