Basic admin functions in OpenMRS 2.3 for users, locations, and GPs

Add an Account Manager App, alot of this code will be copied from a very similar app in the mirebalais project at https://github.com/PIH/openmrs-module-mirebalais. The initial work was done as part of this GSoC 2014 project. Managing locations and global properties are other features that were added, some of that work is incomplete and the intention of this epic to get all the features working properly and to provide a basis for adding more admin features in the future

Dev Notes:

See design call notes from http://notes.openmrs.org/Design-Forum-2015-05-18