fix summary chunk result merge bug (symptom: incorrect merging of min, max arrays across chunks)
add a JsonDiff class. Fix the test_rf_big1_nopoll.py that does many parallel H2O RF (wasn't checking the results correctly)..JsonDiff the results and print. Vary seed= otherwise results don't change (other than the model name I provide)
rf fvec needs real for sample_rate ..was sendd 0 which caused the stack trace.
Merge branch 'master' of github.com:0xdata/h2o
change a param name (rfView=) and hack around rfView/fvec issues for now