Fix bug on error path removal

1st error caused the 2nd error during cleanup, which obfuscated the 1st
error.
Added GroupedAverage skeleton example.
Added run_grouped_average
Commit runner.
Fix a FIXME
Merge branch 'master' of github.com:0xdata/h2o
some bench testing
looser classification error check
DRFProgress does not support API1.

I do not know why DRFProgressPage should support API1?
If the DRFProgressPage supports API1 then poll redirects
in JSON are incorrect.
Merge branch 'master' of github.com:0xdata/h2o
fixes for test.0xdata.com
Merge branch 'master' of github.com:0xdata/h2o
GLM2: Fixed xval_models in json output for glm x-validation.
Merge branch 'master' of github.com:0xdata/h2o
Updated GLM2 api - no GLMProgress, directly go to GLMModelView which handles progress and model display at the same time.
minor edit to glm linear runit, new runit poisson
Merge branch 'master' of https://github.com/0xdata/h2o
updated r unites
bug fixes exposed by tests
add -u switch to avoid downloading h2o stuff (reuse existing)
Merge branch 'master' of github.com:0xdata/h2o