This reverts commit 65b7872e.

if a callback but no static proxy is defined and
no routes are provided then handlers.length is 1.
However the upgrade event is still automagically
attached in spite of having an explicit callback.

[docs] grammar correction

[fix] Examples have working require paths now.

Readme fixes

#107: Set x-forwarded-for header (amongst others)

command line tool - make sure targetPort is an integer