JUnit timestamp parsing

[n1kl]

JUnit timestamp parsing to display correct performence trend graph.

[artem-fedorov]

Thanks for this PR. Please, try to restart Travis again

[codecov-io]

Codecov Report

Merging #174 into master will increase coverage by <.01%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   71.39%   71.39%   +<.01%     
==========================================
  Files          44       44              
  Lines        4142     4146       +4     
  Branches      730      730              
==========================================
+ Hits         2957     2960       +3     
  Misses        898      898              
- Partials      287      288       +1

Impacted Files	Coverage Δ
...udson/plugins/performance/parsers/JUnitParser.java	89.58% <80%> (-1.33%)	⬇️
.../hudson/plugins/performance/reports/UriReport.java	70.77% <0%> (ø)	⬆️

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[artem-fedorov]

Thanks!