Updated java API docs for streaming, along with very minor changes in the code examples.
Only log error on missing jar to allow spark examples to jar.
update comment
Merge pull request #458 from tdas/docs-update

Updated java API docs for streaming, along with very minor changes in the code examples.

Docs updated for:
Scala: StreamingContext, DStream, PairDStreamFunctions
Java: JavaStreamingContext, JavaDStream, JavaPairDStream

Example updated:
JavaQueueStream: Not use deprecated method
ActorWordCount: Use the public interface the right way.
Merge pull request #470 from tgravescs/fix_spark_examples_yarn

Only log error on missing jar to allow spark examples to jar.

Right now to run the spark examples on Yarn you have to use the --addJars option and put the jar in hdfs.  To make that nicer  so the user doesn't have to specify the --addJars option change it to simply log an error instead of throwing.