Multiple trees for DRF; rename Tree.java DTree.java

DRF now builds multiple trees in parallel.
DTree now builds & scores multiple trees.
Multi-tree scoring is (hopefully) the proper ensemble method of totalling the predicted classes across all trees, before making any final votes.
Add a covtype DRF test.
Add triple-nested arrays to AutoBuffer.
Multiple trees for DRF; rename Tree.java DTree.java

DRF now builds multiple trees in parallel.
DTree now builds & scores multiple trees.
Multi-tree scoring is (hopefully) the proper ensemble method of
totalling the predicted classes across all trees, before making any
final votes.
Add a covtype DRF test.
Add triple-nested arrays to AutoBuffer.
did some cleanup of old import packages that weren't used (since we copy boilerplate, they proliferate). also moved more to use parseFile instead of node.put_file and node.parse. Some other updates/checking on some tests. I may have missed some typos
Merge branch 'master' of github.com:0xdata/h2o
reduce the heap to 14 for jenkins
Add sampling, OOBEE to DRF

Also do only 5 trees in parallel (per node), to limit memory issues.
A big covtype burns a fair amount of memory per parallel tree build.
Merge branch 'master' of https://github.com/0xdata/h2o
Update Makefile to use release.properties.
Merge branch 'master' of github.com:0xdata/h2o
A little for genericification
Allow success-examples to be empty/null in docgen
tidy up whitespace, add comments
Clean up Parse2

Clean up Parse2 doc help text.
Move ImportFiles2 & Parse2 to a "Beta!" tab
Cleanup FileIntegrityChecker; make default arg non-default.
Add final keywords; use generification.
Fixed a minor typo which was causing a bug
Updates to build MacOS dmg.
Merge branch 'master' of https://github.com/0xdata/h2o
Redirect Parse2 into a Progress2 page

Allow incremental display of fluid-vec parsing
Merge branch 'master' of github.com:0xdata/h2o
Fix more windows separator stuff.
Merge branch 'master' of github.com:0xdata/h2o