Replace glassfish with jackson

[jirkadanek]

Glassfish is unable to encode a java.lang.Float type
to JSON. This seems trivial omission in the library,
easy to fix... Bug could be raised.

Jackson can encode it just fine. Seems a better choice.

This fixes #27

[codecov-io]

Codecov Report

Merging #28 into master will increase coverage by 0.04%.
The diff coverage is 60%.

@@             Coverage Diff              @@
##             master      #28      +/-   ##
============================================
+ Coverage     70.61%   70.66%   +0.04%     
  Complexity       81       81              
============================================
  Files            43       43              
  Lines          2049     2052       +3     
  Branches        293      293              
============================================
+ Hits           1447     1450       +3     
  Misses          467      467              
  Partials        135      135

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/redhat/mqe/lib/MessageFormatter.java	76.15% <60%> (-0.55%)	0 <0> (ø)
jmslib/src/main/java/com/redhat/mqe/lib/Utils.java	44.82% <0%> (+1.37%)	0% <0%> (ø)	⬇️

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[kornys]

lgtm!