Add JSON endpoint for show for users

LM-BOS-00676321:lolcommit-server jhilker$ bundle exec rake
Run options: 

# Running tests:

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Finished tests in 2.464639s, 4.8689 tests/s, 10.9550 assertions/s.

12 tests, 27 assertions, 0 failures, 0 errors, 0 skips

Run options: 

# Running tests:

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Finished tests in 0.992096s, 34.2709 tests/s, 78.6214 assertions/s.

34 tests, 78 assertions, 0 failures, 0 errors, 0 skips