Bump version to 1.5-develop
fixes #3515 - API handles not found objects with 404
Fixes #4022: Make api puppetrun a PUT for REST standards
fixes #2231 - hostgroup deletion is restricted to hostgroups without children
Bump copyright, remove spurious file
fixes #3983 - added trends:clean to cron
fixes #3940 - extlogout page layout fixed
fixes #3998 - API v2 error on /api/compute_resources, missing gce.json.rabl
fixes #4023 - API v2 - compute resources partials should should attribute alias names and not database column names