Refactor finite series filtering, because jeez
Now we can just apply map in some spots
Actual fix re: TimeSeries iteration vs len/indexing
Merge remote-tracking branch 'graphite-project/0.9.x' into integration
Add test proving re #344.

Tested with fix reverted to ensure it fails correctly too.
Up verbosity of test to see wtf re: db init
Forgot to add fixture
Create empty DB so load-time DB touches don't explode.

See https://github.com/graphite-project/graphite-web/pull/344#issuecomment-51546344
Merge pull request #344 from bitprophet/fix-yMaxValue-when-stacked

Fix yMaxValue when areaMode=stacked