Provide Json output.

[tledoux]

Add new dependencies to generate valid json:
groupId=javax.json,artifactId=javax.json-api
groupId=org.glassfish, artifactId=javax.json
Fixes #385
Doesn't support mix version 0.2.

[tledoux]

Codacy finds too many magic strings... 😒
Travis discovered a new handle 😉 : I really need to learn how to modify the regression tests 😩

[codecov]

Codecov Report

Merging #515 into integration will decrease coverage by 3.7%.
The diff coverage is 21.83%.

@@                Coverage Diff                @@
##             integration     #515      +/-   ##
=================================================
- Coverage          49.44%   45.73%   -3.71%     
- Complexity           984     1046      +62     
=================================================
  Files                 56       56              
  Lines               7768     9165    +1397     
  Branches            1409     1650     +241     
=================================================
+ Hits                3841     4192     +351     
- Misses              3457     4429     +972     
- Partials             470      544      +74

Impacted Files	Coverage Δ	Complexity Δ
...main/java/edu/harvard/hul/ois/jhove/JhoveBase.java	43.34% <100%> (+1.81%)	43 <0> (+2)	⬆️
...src/main/java/edu/harvard/hul/ois/jhove/Agent.java	46.82% <100%> (+1.29%)	14 <1> (+1)	⬆️
...edu/harvard/hul/ois/jhove/handler/JsonHandler.java	21.44% <21.44%> (ø)	43 <43> (?)
...in/java/edu/harvard/hul/ois/jhove/InfoMessage.java	41.17% <0%> (-11.77%)	4% <0%> (-1%)
...ain/java/edu/harvard/hul/ois/jhove/ModuleBase.java	50.69% <0%> (-0.11%)	70% <0%> (-3%)
...edu/harvard/hul/ois/jhove/handler/TextHandler.java	0.54% <0%> (-0.01%)	2% <0%> (ø)
...n/java/edu/harvard/hul/ois/jhove/ChecksumType.java	100% <0%> (ø)	3% <0%> (ø)	⬇️
...a/edu/harvard/hul/ois/jhove/NisoImageMetadata.java	75.64% <0%> (ø)	182% <0%> (ø)	⬇️
...src/main/java/edu/harvard/hul/ois/jhove/Utils.java
... and 11 more

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