better error management in memoize will lead to fewer 500s and more logging
moved the retry-loop and made it happen for 500s as well as request errors
set found to true if we find something, and only clear the error if it was a cache miss
Merge pull request #9 from soundtrackyourbrand/fix/memcache-get

set found to true if we find something, and only clear the error if it was a cache miss

oops
Merge remote-tracking branch 'origin/master' into sofia/bigquery_test