The running user cannot be passed as argument

removed custom function mockUserViews

To execute an activity one of this methods show be called from class <code>ExecuteProcessActivity</code>:
<code>static public Process run(final Process process, final String activityId, final Object object)</code>
or
<code>static public Process run(final Process process, final Class<?> clazz, final Object object)</code>
closes #304