allowJs is set to false in tsconfig.json now; please write all future
code with typescript.
cleanups:
- removed platforms/deprecated
- removed flow/history/old
- see https://github.com/QURIresearch/metaforecast/issues/22
- commented some invalid axios options
- minor fixes with mismatching function arguments
- commented invalid mongo call in databaseReadWithReadCredentials
- {encoding: 'utf-8'} in readFileSync calls
