Patient summary dashboard widgets

This is an epic for creating patient summary widgets for patient dashboard to be included in Reference Application.

https://wiki.openmrs.org/display/docs/Patient+Summary+Widget+Documentation

Widgets should be implemented as customizable apps in the coreapps module as in RA-1293.

All widgets should reuse a template and fragment for title and icon as specified in RA-1301.

All widgets should load data asynchronously using webservices.rest endpoints and be written in Angular 1.x.

Use openmrs-rest Angular component from uicommons (js need to be copied into coreapps).