Spacex-py

**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 4bbe8115482f44dc5601134b15eb265506af5e92
* 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

**Features & Fixes**
* V2 endpoints with improved filtering and schema added in 61
* Improved error handling and status code expectations in 51
* V1 endpoints are now deprecated, and V2 schema was forked from the old DB
* Data validation and custom assertions added in 55 & 58 for better DB consistency and earlier mistake catching thanks to Srokap
* Removed double caching bug in 49
* Added `site_name_long` to all past and future launches in 60

**Features & Fixes**
* FlightClub.io links are now dynamic in d08fb4ed6a7225e487660daf08855d614f698476 from 43
* Content type header now shows application/json in 2a829eb43038fa005833d1c7b096bc36c350d50d from 44
* 30 minute server DB query caching added in 2f2b819dd7ea03d93a06b61bcbad315fc73cdf46
* Various data typo corrections from 45
* Added CRS data for mass returned, flight time, and cargo manifests from 46
* Added detailed reuse stats from 47
* Added endpoints to sort past launches by ASDS or RTLS landings

**Features & Fixes**
* Endpoint and no results errors now return JSON in lieu of strings
* 404 page removed for faster JSON error responses
* Added endpoint for sorting past launches by launchpad
* Set global content type to application/json for proper headers
* Added more ESlint rules for cleaner javascript

**Features & Fixes**
* 1:1 platform switch from Sinatra (Ruby) to Express (Node.js) in 42
* Added Codecov for test coverage monitoring & static code checking
* Test coverage is now 100% 👍
* Added a "Deploy to Heroku" button as an easy deployment option
* Various typo fixes and formatting errors

**Features & Fixes**
* Downgraded Puma version to 3.4 to fix issue that prevented docker from starting 1433a57d4a4c416925738b51220df419bf8b049e
* CORS (Cross Origin Resource Sharing) support added in 8d067ca0ef0266224a9eede212eb068ce9d03af6
* Read-Only database credentials are now hard coded to alleviate an issues with testing going forward.
* Various Rubocop fixes throughout
* Travis CI now used container based builds for faster build startup times
* API version support added in 82b2d00af704bf2ed4b148d48bdfd2be7094425f