add metric capture to js

## SMS

* [x] total unique users (text widget)
* [x] total registered users (text widget)
* [x] total unique users and registered users per week (line graph widget)
* [x] total girl registered users
* [x] total messages sent (text widget)
* [x] total messages delivered (text widget) (will have to be Vumi Go)
* [x] total messages received (text widget)

## USSD

* [x] total unique users
* [x] total registrations (text widget)
* [x] total users and total registrations per week (line graph widget)
* [x] total girl registered users
* [x] total sessions initiated (text widget) (will have to be Vumi Go)
* [x] total sessions per week and total unique users who initiated a session per week (line graph widget) (will have to be Vumi Go)
* [x] articles views per week (line graph widget)
* [x] shangazi advice views per week (line graph widget)
* [x] directory views per week (line graph widget)
* [x] opinions views per week (line graph widget)
* [x] quiz views per week (line graph widget)