Add Models for Account Stats per Day|Week|Month
This MR adds models for Account Stats per Day, Week and Month.
They include as aggregates the most important metrics for Facebook Ads data:
- Impressions
- Reach
- Frequency
- Clicks
- Spend
- CPC
- CPM
- CTR
- Results
- Results from Clicks
- Cost per Result
Closes #11 (closed)