feat(ProcessInstanceAssert): add hasNotPassed(String... activityIds) assertion

Closes #5
Closes #21
Merge branch 'kifj-kifj/master'
chore(ProcessInstanceAssert) remove obsolete code fragment
docs(ProcessInstanceAssert) add javadoc and readme documentation for new methods
refactor(ProcessInstanceAssert): move code for has(Not)Passed assertions to shared private method
test(ProcessInstanceAssert): add some more tests for new assertion 'hasNotPassed'