Fetch all time release stories in one query.
Expand release burnchart cache to allow database to calculate points.
Cache entries for today or later is deleted when a story is updated.
Recalculation of individual stories in done just before showing release
burnchart. For now this recalculates all days of a story.
Fix migration error when uninstalling plugin. Introduced by removing table in a later migration.
Revert "Fix migration error when uninstalling plugin. Introduced by removing table in a later migration."

This reverts commit 8d8dcc195e13dfb6d695a260878a138cee6715ea.
Correct rollback and restore of previous release cache migration
Filename correction
Path correction...
Path again... never pays off to skip a test...
Merge pull request #921 from backlogs/releases/burnchart_performance

Releases/burnchart performance improvement