Fixes equality with ordering of hyperparameters

[eddiebergman]

Fixes #73 in which the following use to be false but is fixed to be true.

f7 = CategoricalHyperparameter("param", ["a", "b"])
f7_ = CategoricalHyperparameter("param", ["b", "a"])
assert f7 == f7_

[codecov]

Codecov Report

Merging #212 (d117338) into master (b6aa830) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
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  Coverage   67.15%   67.15%           
=======================================
  Files          17       17           
  Lines        1629     1629           
=======================================
  Hits         1094     1094           
  Misses        535      535           

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