Fix author validation

[kyleniemeyer]

• [x] Fixes #37 and #40.
• [x] Tests added: test_matching_names

Changes proposed in this pull request:

• Make author validation more robust to handle given names with more than two names (i.e., more than just one first and one middle), and also to handle double-barrel and hyphenated family names.
• test_matching_names now uses pytest fixture to go through a list of test inputs, rather than using many separate tests

@pr-omethe-us/chemked

[codecov-io]

Codecov Report

Merging #45 into master will increase coverage by 0.17%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   93.15%   93.33%   +0.17%     
==========================================
  Files           5        5              
  Lines         336      345       +9     
  Branches       96       98       +2     
==========================================
+ Hits          313      322       +9     
  Misses         13       13              
  Partials       10       10

Impacted Files	Coverage Δ
pyked/validation.py	93.95% <100%> (+0.38%)	:arrow_up:

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