configuration update for version 3.1.1 (#698)

increase worker timeout to 180 seconds (#697)

Fixes 1574785232 (#638)

* switched to using official postgres docker image with postgis installed

* add make target for building docker images

* README update

Prepare 2.8.2 (#267)

* added release notes for older version 2.8.1 release

* preparing for version 2.8.2

Feature/submission background processing (#153)

* feat: put submission updates on background queue

* fix: change task invocation arguments

Merge pull request #57 from takinbo/version2

fixes #54 switched to using alpine linux v3.7