Failures, pending and errors should display a message explaining it

Expected:
bossa:spec md$ phpspec StringCalculatorSpec.php

F

Failures:
1)
'string calculator returns zero with no arguments' FAILED
expected 2, got 0 (using be())
/Users/md/Documents/Lab/phpspec/spec/StringCalculatorSpec.php:10

Finished in 0.006172 seconds

1 examples, 1 failure

Actual:
F

Failures:

Finished in 0.010726 seconds

1 examples, 1 failure