Feature/issue 27 dashboard

1. Total unique users (gage widget)\
2. Total registrations (gage widget)
3. Total unique users and total registrations per week (line chart widget)
4. Total girl registered users (gage widget)
5. Total page views (gage widget)
6. Total comments (gage widget)
7. Top 10 articles by number of pageviews
8. Top 10 articles by number of comments
9. Top 10 discussions by number of comments
10. Number of research tool polls completed per week
11. Total number of newsfeed page views