0.0.7

Add created, created_by columns to artifacts (#305)

* cohort created

* created concept set

* created review study

* last modified, some cohort created_by

* finish cohort created_by

* concept set created_by

* review created_by

* study created_by

* move toApiObject back to controller

* spotbugs

* fix ui tests

* review fixes

* checkstyle