Change R GLM wrapper epsilon to match H2O

1e-4 for all please
Flip ddply to expect multi-return via 'c' not 'cbind'

Expect 'c' results (1 col, many rows) instead of 'cbind' results (many
cols, 1 row) for returns from ddply.
Merge branch 'master' of github.com:0xdata/h2o
Allow exec Types over the wire

ddply functions are distributed, and all the bits most go over the wire