Issues Fixed:
- Remove flask from matcher requirements and dockerfile [Resolves #404]
- use better examples
- Remove output.js [Resolves #400]
- Fix expunge script [Resolves #398]
- Add json-loader to webpack build [Resolves #397]
- use ; delimiter for ids from same source [Resolves #395]
- Remove quotes from the example .env file
- Sort results with NULLs last [Resolves #328]: