Reservoir Sampling v1.
Added LRResult object to encapsulate results (instead of just Json).
Merge remote-tracking branch 'upstream/master'
Fix a missing Nil in Shalala example.
Merge branch 'master' of github.com:jgustave/h2o into jgustave-master

Conflicts:
	h2o-scala/build.sbt
LR code polished.
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'jgustave-master'