Revert "Use Encodable to JSON serialize objects in SwiftMetricsDash instead of SwiftyJSON"

[sjanuary]

Reverts #174 for the time being due to clash with #177

[codecov-io]

Codecov Report

Merging #179 into master will decrease coverage by 0.18%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
- Coverage   16.75%   16.57%   -0.19%     
==========================================
  Files           8        8              
  Lines        1922     1943      +21     
==========================================
  Hits          322      322              
- Misses       1600     1621      +21

Flag	Coverage Δ
#SwiftBAMDC	0% <ø> (ø)	⬆️
#SwiftMetrics	16.57% <0%> (-0.19%)	⬇️
#SwiftMetricsBluemix	20.32% <ø> (ø)	⬆️
#SwiftMetricsDash	18.41% <0%> (-0.23%)	⬇️
#SwiftMetricsKitura	17.96% <0%> (-0.22%)	⬇️
#SwiftMetricsPrometheus	16.57% <0%> (-0.19%)	⬇️

Impacted Files	Coverage Δ
Sources/SwiftMetrics/SwiftMetrics.swift	63.44% <ø> (ø)	⬆️
...wiftMetricsPrometheus/SwiftMetricsPrometheus.swift	0% <0%> (ø)	⬆️
...ources/SwiftMetricsKitura/SwiftMetricsKitura.swift	0% <0%> (ø)	⬆️
Sources/SwiftMetricsDash/SwiftMetricsDash.swift	0% <0%> (ø)	⬆️

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[mattcolegate]

LGTM, builds and sample apps run fine