New client testing syntax

Instead of:
  (expect (+ 1 1) (to-equal 2))
we write:
  (is = (+ 1 1) 2)

Instead of:
  (expect (+ 1 1) (to-equal 2))
  (expect (- 1 1) (to-equal 0))
we write:
  (all-are =
    (+ 1 1) 2
    (- 1 1) 0)