Updated handling of appendables in MRTask2. Appendable Vecs are kept separate from normal Vecs so they can be passed directly instead of via K/V stored and roolups can be computed in standard M/R way.

Vector separation is kept also in map calls, which now have inputs (Chunks) and outputs(NewChunks) separated.
Also, users do not directly create Appendable Vecs, they simply tell MRTask how many output vectros they want to create.
Merge branch 'master' of github.com:0xdata/h2o
Fixed a bug in the GLM Runit test
Merge branch 'master' of https://github.com/0xdata/h2o
Updated GLM2 to work with updated MRTask (no overriding of the dfork!)
Merge branch 'master' of github.com:0xdata/h2o
Head and tail behave properly when n out of bounds
Merge branch 'master' of https://github.com/0xdata/h2o
STDOUT Python wrapper.
Updated FVectTest(missing from my previous commit).
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
Start on Exec2 fvec replacement

Move Console into Beta tab; make it call Exec2 (which is not functional,
so this removes the Console functionality).
Merge branch 'master' of github.com:0xdata/h2o
Test unit setup wrapping stdout.
Prefix python output by date.
Merge branch 'master' of github.com:0xdata/h2o
Remove debug prints
Starting bones of a new ExecQuery
Remove hadoop compile-time warnings by adding annotation jar for CDH4 and
turning off deprecation warnings.