[oshi-demo] Vend JSON via HTTP Server

[dbwiddis]

Fixes #1077

[coveralls]

Coverage decreased (-3.5%) to 78.69% when pulling 7d8a232 on dbwiddis:web-server into 6c41d3d on oshi:master.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c74e2be). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #1095   +/-   ##
=========================================
  Coverage          ?   72.74%           
  Complexity        ?        2           
=========================================
  Files             ?       27           
  Lines             ?     1328           
  Branches          ?      169           
=========================================
  Hits              ?      966           
  Misses            ?      283           
  Partials          ?       79

Impacted Files	Coverage Δ	Complexity Δ
...i-demo/src/main/java/oshi/demo/OshiHTTPServer.java	0% <0%> (ø)	0 <0> (?)

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