Fix crash in stale check when prune config is incomplete

Set release date of 3.5.0

Update version to 3.5.0b2

Make gem test remove existing gem files

Set release date for 3.4.3 to today

set release date for 3.4.2 to today

added tag for 3.4.1

set release date for 3.4 to today

updated 3.3.7 release date to today

added release notes for 3.3.6