Create myuscis postgres database for APIs

Modified the Vagrantfile so the user and database for the myuscis api application is created upon provisioning.
Removed the vagrant.yml file from source control since it's supposed to be a local properties file for each developer.
Modified the Vagrantfile to load the vagrant.yml file from a location relative to the location of the Vagrantfile.  This allows the user to start their vagrant vm from a location other than the myDevBox root.
@craigschneider @aaronFranssell @ChrisPetr0