Version 2.2.0

Features & Fixes

• Added current flight number to launch core data
• Dragon data is now on its own endpoint /v2/capsules
• Vehicle endpoint is now Rocket endpoint /v2/rockets instead of /v2/vehicles
• All rocket data has identical schema for easy comparisons
• Added ordering support for past and upcoming launches in #65
• Updated style guide to Airbnb standards
• Removed needless variable assignments in 4bbe811
• Some refactoring for mongo driver version 3 breaking changes
  • database url updated to new mongo standard
  • moved projection (used to hide document id from results) out of the find method
• Removed unnecessary files like app.json and single line config file