nov/fb_graph — pull request #265 by sylturner (2012-09-27 18:21:24+00:00)
Title: Added support for lifetime_imps on AdCampaign

Facebook mentions `lifetime_imps` in their [Premium Ads documentation](https://developers.facebook.com/docs/reference/ads-api/premium-via-api/).

Added `lifetime_imps` as a supported attribute in `ad_campaign`, and updated the attribute test in `ad_campaign_spec`.