move db cleaner config to separate file
replace rake task db:purge with db:migrate:clean
remove ontology file extensions stubs
clean redis in minitest-setup
put redis cleanup into a rake task
clean redis before test run
use transaction strategy in rspec
use transaction strategy in minitest and cucumber
suppress warnings and notices about transactions
fix typo
fix cleaning of test database
add comment on Rake::Task.overwrite/abandon
Merge pull request #915 from ontohub/855-proper_database_cleaning

855 proper database cleaning