Merge branch 'improve-dev-seeds' into 'master'

app/services/projects/create_service.rb

db/fixtures/development/01_admin.rb

db/fixtures/development/04_project.rb

db/fixtures/development/05_users.rb

db/fixtures/development/07_milestones.rb

db/fixtures/development/08_wall.rb

db/fixtures/development/09_issues.rb

db/fixtures/development/10_merge_requests.rb

db/fixtures/development/11_keys.rb

db/fixtures/development/13_comments.rb