partial work because git is crap

1/2 done stuff that i must make a new branch on in order to move changes
about
i hate git
first is test for hex-666 (old failure)
2nd: forced separator to be comma. still fails
Small test cases for GLM, K-means, and RF
Next round of writable-vecs; works distributed

Only tested lightly!!!  But appears I can read/write some fluid vecs on
2 nodes correctly.
Merge branch 'master' into cliffc-fvec3
Merge branch 'master' into cliffc-fvec3
Commented a sample
Merge branch 'master' of git@github.com:0xdata/h2o.git
Using Maven convention for samples
Add samples to the build.
get ready for redirecting the import folder to import hdfs with s3n uri (instead of import s3)
this will allow us to import to a path, not just a bucket, so we should avoid the timeout when importing the whwhole home-0xdiag-datasets bucket