Tests for slice/array returned from jrpc calls as well as a cleaner shortcut: jrpc.GetArray()

[ldemailly]

Add tests for slice/array returned from jrpc calls as well as a cleaner shortcut/example of use: jrpc.GetArray()

Also fix #633 incidentally

[codecov]

Codecov Report

Base: 88.5% // Head: 88.5% // Increases project coverage by +0.0% 🎉

Coverage data is based on head (3e8550b) compared to base (fbcebcb).
Patch coverage: 100.0% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #634   +/-   ##
======================================
  Coverage    88.5%   88.5%           
======================================
  Files          30      30           
  Lines        4345    4350    +5     
======================================
+ Hits         3844    3849    +5     
  Misses        336     336           
  Partials      165     165           

Impacted Files	Coverage Δ
jrpc/jrpcClient.go	100.0% <100.0%> (ø)

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[wiardvanrij]

Awesome :D