Schischkin

#329

ESLint reports some errors. See https://travis-ci.org/github/zalando/tailor/jobs/767330074 Also there is a lot of deprecated code/function usage. `lib/request-fragment.js:34` `tests/filter-headers.js` `tests/fragment.events.js` `tests/fragment.js` `tests/handle-tag.js` `tests/request-fragment.js` `tests/serializer.js` `tests/tailor.events.js` `tests/tailor.js` `tests/transform.js` ...

It is not uncommon to switch between environments (dev, staging, prod, ...). It would be nice if it is possible to implement a solution to provide it out of the...