table: shorten large cells, respect :column-width

fixes #3

(term:table '(("name" "age" "email")
              ("me" 7 "some@blah")
              ("me" 7 "some@with-some-longer.email")))

+---------+---------+---------+
|name     |age      |email    |
+---------+---------+---------+
|me       |7        |some@blah|
+---------+---------+---------+
|me       |7        |some@w(…)|
+---------+---------+---------+

version 0.1.2

version 0.1.1

mentioned installation via Quicklisp