Major changes to reporting page, schema, and populate.js file

This pull request does the following:

1.) Add initial support for a risk proximity report page, including a new controller titled 'processing controller'.

2.) Add logo to the banner of the site for improved branding.

3.) Add new table for risk reports.  This table will allow us to browse recent reports for a given disease.

4.) Add essential table headers to the schema, including dates of infection and symptoms for diseased users, disease contagiousness and descriptions, etc. (see changes to schema).

5.) I updated the populate.js file to accomodate the schema changes, including support for all new table headers.  It can still be run with 'grunt populateDB'.