Update sinatra-activerecord to 2.0.3
Update dotenv to 1.0.2
Update rack-contrib to 1.2.0
Update activerecord to 4.2.0
Update puma to 2.10.2
Update sentry-raven to 0.12.2
Add comment about foreman
Raven captures exceptions in rake tasks automatically since 0.11.1
Add empty seeds file