GPII-752: Add status messages to allow the user to know what's happening in the system

This pull requests adds status messages for:
 - Saving and thus logging in (PMT)
 - Loggint out in PMT
 - Saving and Applying in PCP
 - Making a change in the settings in PCP
 - Logging out from PCP

Currently, with this pull request the whole workflow of PMT & PCP is being described with short status messages.

It was decided in the comments of http://issues.gpii.net/browse/GPII-752 that the status messages will move along, in parallel with the functionality of both panels. Once another functionality part is added, the issue perhaps should be reopened to reflect the functionality improvement with another message.
I'm going to guess that the problem is related to https://github.com/radmanovi4/prefsEditors/blob/gpii-752/src/shared/adjusters/js/prefsEditor.js#L99-L105 . First of all, this should be defined with a `modelListener` instead of in the `listeners` block. I'm assuming the workflow is that the user clicks "logout" in the user interface. This causes the model to be reset. At which point you want the `onSettingChanged` event to fire followed by the `onLogout` event. Is that correct? I would have assumed this would still work. Do you have any more info on why it's not firing in the correct order?