Fix strange JRuby test bug where some results are lost

duplicate by running
FAIL_FAST=true rspec --seed 60493
with jruby 1.7.8 (installed via rvm)
only when either of the two previously-loaded spec files
 contain a describe block.  Even empty.

MetricFu::HotspotsGenerator analyze method should put the changes into a hash
     Failure/Error: expect(details).to eq(expected_details)

       expected: {"flog"=>"complexity is 37.9", "reek"=>"found 2 code smells"}
            got: {"reek"=>"found 2 code smells"}

       (compared using ==)

       Diff:
       @@ -1,3 +1,2 @@
       -"flog" => "complexity is 37.9",
        "reek" => "found 2 code smells"
     # /home/travis/build/metricfu/metric_fu/spec/metric_fu/metrics/hotspots/hotspots_spec.rb:40:in `(root)'
Remove unnecessary test code