GPII-625: PMT is able to save settings to the online preferences server

This pull request updated @jobara's GPII-625 branch with master and removes some unneeded wiring from PCP that caused a second instance of GPIIStore to be created which always pointed to "localhost:8081" and broke the support of the cloud-based preferences server.
Confirming that this worked by configuring my GPII instance this way:
Change this file: https://github.com/GPII/universal/blob/master/gpii/node_modules/flowManager/configs/development.json#L14 to read

            "preferences": "http://preferences.gpii.net/user/%token",