Remove subject from the JWT verification options (#686)
Remove subject from the JWT verification options (#686)

As discussed in #684, the current default for subject causes token
verification to fail if sub is overriden.

Removing subject from default options might be a breaking change as
people might rely on it.

Remove subject from verification options, so it's not checked. This is
a safer way.
feathersjs/feathers-passport-jwt,feathersjs/feathers-passport-jwt,feathersjs/feathers-authentication