[OCCA] Add OCCA as git submodule

[noelchalmers]

No description provided.

[codecov]

Codecov Report

Merging #72 (c06b002) into master (6f2382d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #72   +/-   ##
=======================================
  Coverage   70.22%   70.22%           
=======================================
  Files          12       12           
  Lines         131      131           
=======================================
  Hits           92       92           
  Misses         39       39           

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