Merge branch 'rubocop'

* rubocop:
  Additional fixes for rubocop 1.10.1
  Switch to rubocop 0.89.1

Switch to rubocop 0.89.1

This is the rubocop in new Debian stable

Customer Info

This should allow us, the admins, to query information about a customer
without having to dive in and run a couple redis queries and some
database queries before getting the full picture of who we're talking
to.

It also allows the users to request some data about themselves. Balance and
phone number are already visible in other places, but their expiry is currently
not, and people have been asking about it.