NAMD/mediacloud_backend — pull request #69 by flavioamieiro (2014-09-15 17:26:54+00:00)
Title: Feature/convert tweet times to datetime

This follows @elisamussumeci 's suggestion to use `Datetime` objects in our date field. @fccoelho and @elisamussumeci , please review this code and let me know if it's OK to merge.