parallelize cholesky decomposition on single node.
log timing info
undo change on sparse*dense parallelization
Fixed bugs in cut and started working on cbind
Merge branch 'master' of https://github.com/0xdata/h2o
parallel cholesky clean up
Tweaking EC2 tests
Merge branch 'master' into dgram
better error message on missing response_info during fvec polling
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
Parse2 now supports response_info parameter.

It is kind of hack since Parse2 does not extend Request2.
Solutions are:
 - move field response_info into Request
 - Parse2 inherits from Request2
Fix header names not getting written back
Merge branch 'master' of github.com:0xdata/h2o
Saving some memory by using floats in CollectPredTask.

SetWrkTask writes only floats, CollectPredTask collected double which
did not make sense. Switched to floats.
match up with Tongxin's latest summary2
Merge branch 'master' of github.com:0xdata/h2o
Incorporated Spencer's comment about shuffling oob rows.
Removed duplicate fields from progress.
Merge branch 'master' of github.com:0xdata/h2o