Acceptance tests were not working as they wasn't adapted to the Angular
framework after the migration. This commit fixes these test that now
work again.

Commit 9ef1c405 redesigned the user interface by introducing Bootstrap.
Although the structure changes where minimal, the changes on class types
caused the page object classes' selectors to fail.

This commit fixes this error and, in addition, fixes an unexpected error
on person deletion. This error was caused due to a missing wait for an
AJAX request response.

The tests classes have been simplified by delegating some of the
functions in the test classes to external utility classes. For example,
a PeopleDataset has been added to manage the dataset or the
IsEqualToEntity Hamcrest matcher has been added to simplify entity
comparisons.

In addition, a PersonUnitTest class has been added to test the Person
entity.