Move GeminiClient to Crayfish Commons

[whikloj]

GitHub Issue: Islandora/documentation/issues/800

Required for: Islandora/Crayfish#44

What does this Pull Request do?

Moves the GeminiClient from Milliner to CrayfishCommons and adds a findByUrl function.

What's New

• Does this change require documentation to be updated? no
• Does this change add any new dependencies? no
• Does this change require any other modifications to be made to the repository (ie. Regeneration activity, etc.)? no
• Could this change impact execution of existing code? no

How should this be tested?

Internal tests and testing of associated PR: Islandora/Crayfish#44

Interested parties

@Islandora-CLAW/committers

[codecov]

Codecov Report

Merging #16 into master will increase coverage by 1.28%.
The diff coverage is 98.55%.

@@             Coverage Diff              @@
##             master      #16      +/-   ##
============================================
+ Coverage     91.04%   92.32%   +1.28%     
- Complexity      111      126      +15     
============================================
  Files             8        9       +1     
  Lines           335      404      +69     
============================================
+ Hits            305      373      +68     
- Misses           30       31       +1

Impacted Files	Coverage Δ	Complexity Δ
src/Client/GeminiClient.php	98.55% <98.55%> (ø)	15 <15> (?)

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[dannylamb]

Turns out I need this for getting exposing the Fedora URL as a link header on GET/HEAD requests, so Imma gonna merge this in now since it won't hurt anything.