Generates comments including column name for each model col domain.
Fix in tests for javaprediction.

- incorrect handling of header (header was not properly skipped)
- incorrect handling of NAs
- minor code polishment
renamed default column names to C1,C2,…,CN from 0,1,…,n
Proper handling of NaN in scoring.

Now generated code and interpreter match during handling NaN during
prediction.
Merge branch 'master' of github.com:0xdata/h2o
Report proper NaN if mapping for a given enum-value is not found.
Fixed a bug in passing class weights to RF1
Fix for PUB-112. Forgot to subtract 1 to get null degrees of freedom
Dropped col.names parameter by accident
Remove all matching H2O keys before importing.

Change "import folder" to "sync folder".  Remove all keys with
file-prefix names matching the folder, before importing.  This will
force a re-load of data in the same directory - so if you've removed a
junk file from a directory & re-import, you'll have keys that exactly
match the directory.  Ditto for editing a file & re-importing.
Merge branch 'master' of https://github.com/0xdata/h2o
Updated python tests to work with new default column names in VAs (C1,C2,…,CN instead of 0,1,…,N)
Merge branch 'master' of github.com:0xdata/h2o
Performance harness prototype
Basic resource check on parsing large files

Toss an IAE if the dataset on disk is >2x cluster memory (Parse1) or >
4x cluster memory (Parse2).  Fix for PUB-95
Merge branch 'arno-deeplearning'
Minor fixes in DTree java code generator.
Merge branch 'master' of github.com:0xdata/h2o
JStack logs

Fixes PUB-22
Free large GC pointers after use

Required to allow GC to catch-up during a low-memory parse.
Also, narrow scope & add Override's