Clytwynec/post hars to harstorage

@cgoldberg @benpatterson @jzoldak  Please review.
yea agreed... it should probably be a Context Manager that gets initialized with a config object.
I just entered it as an enhancement: https://github.com/edx/harprofiler/issues/19

we can do without to get a first iteration of this merged, but we should refactor in a followup pull request.