publish v2.8.0 PhilWaldmann#79

docs fix

add more migration functions/options PhilWaldmann#76

add more migration functions/options PhilWaldmann#76

field name convert functions PhilWaldmann#72

Merge branch 'master' of https://github.com/PhilWaldmann/openrecord

add knex link to custom operator docs

replace jshint with eslint + update code style

remove log + fix test

publish 1.10.16