update styles to work on lower resolution desktop machines

Design changes to accommodate smaller desktops (between 992px and 1199px wide), and in some cases, even smaller devices.

* Use smaller width for bar graphs on dashboard when viewed on small desktop
* Use "Initial Patient Pop." instead of "Initial Patient Population" on measure listing/patients listing
* Almost complete redesign of Patient page to be more responsive/more manageable

Some stylesheet organization is also done as part of this PR.