SPARK-1483: Rename minSplits to minPartitions in public APIs

https://issues.apache.org/jira/browse/SPARK-1483

From the original JIRA: " The parameter name is part of the public API in Scala and Python, since you can pass named parameters to a method, so we should name it to this more descriptive term. Everywhere else we refer to "splits" as partitions." - @mateiz

Author: CodingCat <zhunansjtu@gmail.com>

Closes #430 from CodingCat/SPARK-1483 and squashes the following commits:

4b60541 [CodingCat] deprecate defaultMinSplits
ba2c663 [CodingCat] Rename minSplits to minPartitions in public APIs
Reuses Row object in ExistingRdd.productToRowRdd()

Author: Cheng Lian <lian.cs.zju@gmail.com>

Closes #432 from liancheng/reuseRow and squashes the following commits:

9e6d083 [Cheng Lian] Simplified code with BufferedIterator
52acec9 [Cheng Lian] Reuses Row object in ExistingRdd.productToRowRdd()
[SPARK-1520] remove fastutil from dependencies

A quick fix for https://issues.apache.org/jira/browse/SPARK-1520

By excluding fastutil, we bring the number of files in the assembly jar back under 65536, so Java 7 won't create the assembly jar in zip64 format, which cannot be read by Java 6.

With this change, the assembly jar now has about 60000 entries (58000 files), tested with both sbt and maven.

Author: Xiangrui Meng <meng@databricks.com>

Closes #437 from mengxr/remove-fastutil and squashes the following commits:

00f9beb [Xiangrui Meng] remove fastutil from dependencies
SPARK-1357 (addendum). More Experimental items in MLlib

Per discussion, this is my suggestion to make ALS Rating, ClassificationModel, RegressionModel experimental for now, to reserve the right to possibly change after 1.0. See what you think of this much.

Author: Sean Owen <sowen@cloudera.com>

Closes #372 from srowen/SPARK-1357Addendum and squashes the following commits:

17cf1ea [Sean Owen] Remove (another) blank line after ":: Experimental ::"
6800e4c [Sean Owen] Remove blank line after ":: Experimental ::"
b3a88d2 [Sean Owen] Make ALS Rating, ClassificationModel, RegressionModel experimental for now, to reserve the right to possibly change after 1.0
SPARK-1523: improve the readability of code in AkkaUtil

Actually it is separated from https://github.com/apache/spark/pull/85 as suggested by @rxin

compare

https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/AkkaUtils.scala#L122

and

https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/AkkaUtils.scala#L117

the first one use get and then toLong, the second one getLong....better to make them consistent

very very small fix........

Author: CodingCat <zhunansjtu@gmail.com>

Closes #434 from CodingCat/SPARK-1523 and squashes the following commits:

0e86f3f [CodingCat] improve the readability of code in AkkaUtil
Fixed broken pyspark shell.

Author: Reynold Xin <rxin@apache.org>

Closes #444 from rxin/pyspark and squashes the following commits:

fc11356 [Reynold Xin] Made the PySpark shell version checking compatible with Python 2.6.
571830b [Reynold Xin] Fixed broken pyspark shell.
SPARK-1456 Remove view bounds on Ordered in favor of a context bound on Ordering.

This doesn't require creating new Ordering objects per row.  Additionally, [view bounds are going to be deprecated](https://issues.scala-lang.org/browse/SI-7629), so we should get rid of them while APIs are still flexible.

Author: Michael Armbrust <michael@databricks.com>

Closes #410 from marmbrus/viewBounds and squashes the following commits:

c574221 [Michael Armbrust] fix example.
812008e [Michael Armbrust] Update Java API.
1b9b85c [Michael Armbrust] Update scala doc.
35798a8 [Michael Armbrust] Remove view bounds on Ordered in favor of a context bound on Ordering.
SPARK-1482: Fix potential resource leaks in saveAsHadoopDataset and save...

...AsNewAPIHadoopDataset

`writer.close` should be put in the `finally` block to avoid potential resource leaks.

JIRA: https://issues.apache.org/jira/browse/SPARK-1482

Author: zsxwing <zsxwing@gmail.com>

Closes #400 from zsxwing/SPARK-1482 and squashes the following commits:

06b197a [zsxwing] SPARK-1482: Fix potential resource leaks in saveAsHadoopDataset and saveAsNewAPIHadoopDataset
README update

Author: Reynold Xin <rxin@apache.org>

Closes #443 from rxin/readme and squashes the following commits:

16853de [Reynold Xin] Updated SBT and Scala instructions.
3ac3ceb [Reynold Xin] README update
Use scala deprecation instead of java.

This gets rid of a warning when compiling core (since we were depending on a deprecated interface with a non-deprecated function).  I also tested with javac, and this does the right thing when compiling java code.

Author: Michael Armbrust <michael@databricks.com>

Closes #452 from marmbrus/scalaDeprecation and squashes the following commits:

f628b4d [Michael Armbrust] Use scala deprecation instead of java.
Add insertInto and saveAsTable to Python API.

Author: Michael Armbrust <michael@databricks.com>

Closes #447 from marmbrus/pythonInsert and squashes the following commits:

c7ab692 [Michael Armbrust] Keep docstrings < 72 chars.
ff62870 [Michael Armbrust] Add insertInto and saveAsTable to Python API.
[SPARK-1535] ALS: Avoid the garbage-creating ctor of DoubleMatrix

`new DoubleMatrix(double[])` creates a garbage `double[]` of the same length as its argument and immediately throws it away.  This pull request avoids that constructor in the ALS code.

Author: Tor Myklebust <tmyklebu@gmail.com>

Closes #442 from tmyklebu/foo2 and squashes the following commits:

2784fc5 [Tor Myklebust] Mention that this is probably fixed as of jblas 1.2.4; repunctuate.
a09904f [Tor Myklebust] Helper function for wrapping Array[Double]'s with DoubleMatrix's.
show stage failure reason in UI
style fix
address andrew's comments
address andrew's comments
set a default value of failureReason
address Kay's comments
fix compile error
address Aaron's comments