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.