Added Contact Page.
Created Pie Chart for type and cumulative line Chart for modified_date.
Added Gender Filter to Contact.
Need to fix the color codes as well.
Added Joined By Day.
Need suggestions about more options to be presented.
Added Link on the main extension page for contacts.
Added Contact Source with default None
Added Labels
Updated d3
Added Contacts Overview
Merge pull request #4 from siddharthg/master

Added Contacts Dashboard AND update d3.
@siddharthg next time. make two different PR for different updates. To do that, you need to create two separate branches (or wait between the PR)