Fix for PUB-200

Internal pretty printer guessing type of column based on first chunk.
However, for a float column and non-float first chunk, guesser return
bad formatting string.
Minor fixes in Shalala building

- Increased Xmx for 'sbt run'.
- Removed package.scala since Scalac does not like it
Merge branch 'master' of github.com:0xdata/h2o
Excitingly, DTask copyOver was backwards

Exception-dropping much?  Mostly means MRTask2 w/ distributed-exceptions
could (sometimes) silently drop them.
Tweak parser header/col detector

When 1st 10 rows show different column counts, if the 1st line is also
the longest - take that as the number of cols, else take the col-count
that occurs most often.
Theory is the 1st line is a header, and all cols have a label even if
some later cols are missing
Merge branch 'master' of github.com:0xdata/h2o
test_GLM_basic_browser.py replays a json sequence it just did, using html thru a browser.
gets stack trace around ROCplot like user reported (prostate dataset..may be dataset dependent?)
test does benign then prostate?
https://0xdata.atlassian.net/browse/PUB-261
Merge branch 'master' of https://github.com/0xdata/h2o
More CM tests.
add null check before ROCplot function call
should not be after (loads axes but no plot other wise...)
KMeansApply now reports a categorical vector of predicted clusters.
Merge branch 'master' of https://github.com/0xdata/h2o
some test.0xdata.com fails
Merge branch 'master' of https://github.com/0xdata/h2o
Fix for PUB-251. KMeans2 clusters are reported as categoricals.
Merge branch 'master' of https://github.com/0xdata/h2o
just ask for one node
Merge branch 'master' of https://github.com/0xdata/h2o
beef up this test a little
add a test for HEX-1613