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.
If the listener is moved to fluid.prefs.GPIIEditor component, then in PCP the onLogout event seems to get fired before the onSettingChanged event. Therefore when logging out (thus making a 'reset' to the adjusters (thus changing the model)), the final message being shown is the one for setting changed https://github.com/radmanovi4/prefsEditors/blob/gpii-752/src/shared/adjusters/js/prefsEditor.js#L111-L115. How do you think we should surround this?