Add support for Slack notifications

Release 3.0.15, fix for installer subprocess termination

Release 3.0.14, process shutdown bugfix in tds_installer and SQLA log…

…level tweak

Split /performance by obj_type

Release 3.0.11, new performance endpoint for REST API

Release 3.0.10, make tds installer daemons more robust to zookeeper f…

…ailures

Add datetime filtering for apps/pkgs search

Add API support for app repo column

Add before/after support for *deployment search

Add pagination to /bystander URL