config: add STRINGER_DATABASE_{HOST,PORT}
reset db with rake db:migrate VERSION=0
Fixed expanding absolute urls

StoryRepository.expand_absolute_urls crashes on line 69 when the tag
being modified doesn't contain url attribute. This commit fixes that
issue.
Swap nil check to better css selector, #197
Merge branch 'pr/190'
Add down migration for change_column type
Merge branch 'pr/192'
update translations, [ci skip]