Feature/add people tool

This includes changes for displaying member count for each section, on the page that displays the list of sections. The UI has also been modified to reflect the count.(As of now all the enrollees will be displayed. If there are people having 2 roles within a section, they will be counted separately. If it's determined that this needs to change, additional filters could be applied, but the  base method would still remain the same)
Right -we talked about calculating the count  using a max of 2 calls based on first, last and next till we saw the note that Carter pointed out.
Paginating such results(in general for all APIs) seems to be something that will be handled eventually in the SDK. Instead of reworking something that is also being solved in the SDK, we could for now improve the efficiency of this call  by passing a very high 'per_page' in the api call? [so set  the per_page=1000 even if canvas cuts it off at 50]