additional converters
updated dependencies
basic user handling (no oauth yet)
schema directory
updated submodule
created schema servlet under /schema and moved rest to /rest
adjusted log files
started API documentation in README
fixed 404 at /rest
return 404 for not existing users
ability to delete a user
support for HTTP delete on /rest/users/:username
Merge branch 'delete' into dev
added DELETE /rest/users/:username response
Merge branch 'dev' of https://github.com/car-io/car.io-server into dev
Merge branch 'dev'