PUB-866: Add ChunkSummary.  Uses MRTask2 to compute a chunk summary for a frame.
Currently only has a toString() function for display, no JSON API.
PUB-865: Log whether -single_precision was specified.
PUB-866: Log ChunkSummary after parsing.
Filter Model & OldModel keys

Better filtering of Model keys
PUB-864 isn't happening if PUB-863 hasn't messed up the machine, so remove the NOPASS from the test case.
Test case for PUB-589.
scoping enchancements in h2o.exec (fix a few tests)
Test case for PUB-532.
Test case for PUB-474.
PUB-556 throw illegal argument exception for out of bounds column selection
PUB-866: cosmetics.
Merge branch 'master' of https://github.com/0xdata/h2o
Merge branch 'master' of https://github.com/0xdata/h2o