Check for repeated strings within the password

[joshtriplett]

/z/z/z/z/z/z/z/z
Pass /z/z/z/z/z/z/z/z   Length 16   Entropy 94.122
  Type: Bruteforce  Length 16  Entropy 94.122  /z/z/z/z/z/z/z/z
    Calculation Time 0.03ms

This should get detected as a trivial repeating pattern.

[tsyrogit]

The latest code has support for repeated patterns, words etc.

[LtqxWYEG]

Not quite: dropbox/zxcvbn#240