Add external configurations to .codeclimate.yml

[davehenton]

Add custom .codeclimate.yml which grabs externally hosted config files for PMD and checkstyle

[codecov]

Codecov Report

Merging #18 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #18   +/-   ##
=========================================
  Coverage     90.21%   90.21%           
  Complexity      117      117           
=========================================
  Files            17       17           
  Lines           276      276           
  Branches          7        7           
=========================================
  Hits            249      249           
  Misses           15       15           
  Partials         12       12

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[coveralls]

Coverage remained the same at 98.0% when pulling b94bdbd on davehenton:master into 6ed3f5f on thejohnfreeman:master.

[thejohnfreeman]

Thanks for the contribution, Dave! Can you explain for me how CodeClimate knows which fetched files configure which engines?

[coveralls]

Coverage remained the same at 98.0% when pulling 5523008 on davehenton:master into 6ed3f5f on thejohnfreeman:master.