Scalaz validate syntax for RefinedTypeOps

[kusamakura]

Port of #382 for scalaz. It's all @howyp :)

[codecov]

Codecov Report

Merging #385 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #385      +/-   ##
=========================================
+ Coverage   96.59%   96.6%   +<.01%     
=========================================
  Files          42      43       +1     
  Lines         499     500       +1     
  Branches       10      10              
=========================================
+ Hits          482     483       +1     
  Misses         17      17

Impacted Files	Coverage Δ
.../main/scala/eu/timepit/refined/scalaz/syntax.scala	100% <100%> (ø)

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[fthomas]

LGTM, thanks @kusamakura!