Add hex/Quantiles work-in-progress. Had to comment out NN from water/api/RequestServer.java
Fix name of quantile_a..f for API
RequestServer: comment out NN and include Quantiles
C2Chunk: debugging null ptr
Merge branch 'stephen_quantiles'
Added page for downloading R package
Fixed a couple of typos
And now it's working on Windows too
move some key delete stuff around and update
Merge branch 'master' of github.com:0xdata/h2o
Additional info on R package and MD5 checksum
Merge branch 'master' of https://github.com/0xdata/h2o
Updated Exception roll up.

Now all DTasks have exception field and RPCCall has onExceptionalCompletion handler which will send answer back with exception send.

On the caller's side, tasks which get response with exception being set will return via completeExceptionally. thus any exception should be propagated from the source to completes and callers of .get() / join() / invoke alike.
Merge branch 'master' of github.com:0xdata/h2o
Rewrite Quantiles with bin-based MR algorithm. Partition HTML stuff into QuantilesPage, similar to Summary/SummaryPage.
uncommented cancellation of remote execs in MRTask2 if some of local jobs throws.
Merge branch 'master' of https://github.com/0xdata/h2o
Changed access rights of DTask._exception to protected from private.
Merge branch 'master' of github.com:0xdata/h2o
commented out reference to missing constructor in RequestServer.