Add a summary tab to Javametrics.

[hhellyer]

Add a new tab to seperate summary data for the whole run from data the rolling graphs for the last 15 minutes.

These changes depend on RuntimeTools/graphmetrics#36 in graphmetrics.

[codecov-io]

Codecov Report

Merging #49 into master will increase coverage by 2.29%.
The diff coverage is 84.12%.

@@             Coverage Diff              @@
##             master      #49      +/-   ##
============================================
+ Coverage     41.77%   44.07%   +2.29%     
- Complexity       78       80       +2     
============================================
  Files            21       21              
  Lines           620      658      +38     
  Branches         52       55       +3     
============================================
+ Hits            259      290      +31     
- Misses          347      351       +4     
- Partials         14       17       +3

Impacted Files	Coverage Δ	Complexity Δ
.../ibm/javametrics/dataproviders/GCDataProvider.java	71.42% <66.66%> (-7.74%)	6 <3> (+2)
...javametrics/dataproviders/DataProviderManager.java	94.62% <91.11%> (-0.84%)	7 <2> (ø)

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[tobespc]

LGTM