Simple PageRank algorithm implementation in Python for SPARK-760
Changed yarn.version to 2.0.5 in pom.xml
Change scala.Option to Guava Optional in Java APIs.
Code update for Matei's suggestions
Create SparkContext in beforeAll for MLLib tests
This overcomes test failures that occur using Maven
Clean up scaladoc in ML Lib.
Also build and copy ML Lib scaladoc in Spark docs build.
Some more minor cleanup with respect to naming, test locations etc.
Add ML Lib scaladoc to API dropdown
Merge pull request #806 from apivovarov/yarn-205

Changed yarn.version to 2.0.5 in pom.xml
Merge pull request #809 from shivaram/sgd-cleanup

Clean up scaladoc in ML Lib.
Fix import organization.
Merge pull request #807 from JoshRosen/guava-optional

Change scala.Option to Guava Optional in Java APIs
Merge pull request #812 from shivaram/maven-mllib-tests

Create SparkContext in beforeAll for MLLib tests
Implementing SPARK-865: Add the equivalent of ADD_JARS to PySpark

Now ADD_FILES uses a comma as file name separator.
Merge pull request #813 from AndreSchumacher/add_files_pyspark

Implementing SPARK-865: Add the equivalent of ADD_JARS to PySpark
Merge pull request #802 from stayhf/SPARK-760-Python

Simple PageRank algorithm implementation in Python for SPARK-760