Merge pull request #2 from tristaneuan/master

merge data extraction overseer/harvester rewritten with multiprocessing.Pool
better name for data extraction group in autoscale monitor
replace lower-level bucket.get_all_keys with paginating/iterating bucket.list
first stab at transferring entities from s3 to solr
fix string decompression for title interactions
consolidated data overseer/harvester into cache_data; handled already-deleted event files