MAHOUT-1529(e): Move dense/sparse matrix test in mapBlock into spark (Anand Avati via dlyubimov)
All math-scala, spark tests are  passing.
this closes apache/mahout#29

Squashed commit of the following:

commit 1e3cdb68198636c9f38f2d41d782d12edba7a2f7
Author: Anand Avati <avati@redhat.com>
Date:   Mon Jul 14 17:20:09 2014 -0700

    MAHOUT-1529: Move dense/sparse matrix test in mapBlock into spark/

    In h2o engine, the Matrix provided to mapBlock() is an instance of
    "H2OBlockMatrix extends AbstractMatrix", and neither a DenseMatrix
    nor SparseMatrix. H2OBlockMatrix is a 0-copy virtual Matrix exposing
    just the partition's data (created at almost no expense), and creates
    a copy-on-write Matrix only if modified by the blockmapfunction.

    So these two tests are failing with h2obindings. Hence moving these two
    tests into spark module.

    Signed-off-by: Anand Avati <avati@redhat.com>
MAHOUT-1595: MatrixVectorView - implement a proper iterateNonZero() (Anand Avati via dlyubimov)
this closes apache/mahout#25

Squashed commit of the following:

commit eb2aa35da282b8955907fcd1ef358e825a100e95
Author: Anand Avati <avati@redhat.com>
Date:   Wed Jul 9 14:29:13 2014 -0700

    MAHOUT-1595: MatrixVectorView - implement a proper iterateNonZero()

    Previous implementation was broken as it was just calling iterator()

    Signed-off-by: Anand Avati <avati@redhat.com>
MAHOUT-1597: A + 1.0 (element-wise scala operation) gives wrong result if rdd is missing rows, Spark side (dlyubimov)
This closes apache/mahout#33

Squashed commit of the following:

commit 9038b2c248ec163e0ff85dd37cb109345b3bbb9d
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Mon Jul 28 10:22:30 2014 -0700

    in-place performance enhancement at the risk of side-effects, for now

commit 35c873cceeda87b7b212677bffc0a21877932deb
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 15:34:00 2014 -0700

    CBind test tweak

commit 005aeccd353faeb59f2ddb2003f393a603978edb
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 15:33:18 2014 -0700

    Cbind test

commit 57f669a7d50097a5a816ce13ca8230f6c6742b65
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 14:57:57 2014 -0700

    Also fixing `A ew B` with missing rows operands

commit 2063c5ccaf88bf31d7f5c1dd3d1650925c4dfd58
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 14:12:56 2014 -0700

    style

commit 5d8e1407a7ea2535ae6d00701ed4f60390c1b30e
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 14:09:11 2014 -0700

    Orientation changing unary ops cannot produce missing rows

commit c9ac3be81ed464ccc4d440b8187e15efa9a21193
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 14:03:25 2014 -0700

    Tests, passing .

commit 1ff376b2ddd1bcbe61f896d14e27d7a413e7313c
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 13:23:14 2014 -0700

    Code up for lazy int-keyed missing rows fix

commit 746b3ddc6c0e7e8bb89ce591c32ba1b70ec688e6
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Tue Jul 22 11:25:57 2014 -0700

    WIP

commit 45642b65f3f1620a4e2187af4b2b54e26ce1c42e
Author: Dmitriy Lyubimov <dlyubimov@apache.org>
Date:   Mon Jul 21 18:19:37 2014 -0700

    WIP
closes apache/mahout#27, nonsensical PR
MAHOUT-1596: implement rbind() operator

This closes apache/mahout#30

Conflicts:
	math-scala/src/test/scala/org/apache/mahout/math/drm/RLikeDrmOpsSuiteBase.scala
NOJIRA: renaming distributed ALS `als` -> `dals` to follow convention with other decomposition notations.
Merge branch 'master' into mahout-1541