Initial work to rename package to org.apache.spark
Small tweak to docs gradient
Update docs for new package
Remove shutdown hook to stop jetty; this is unnecessary for releasing
ports and creates noisy log messages
Add banner to PySpark and make wordcount output nicer
Fix more URLs in docs
Fix over-zealous find-and-replace in HTML
Fix some URLs
More fixes
Move some classes to more appropriate packages:

* RDD, *RDDFunctions -> org.apache.spark.rdd
* Utils, ClosureCleaner, SizeEstimator -> org.apache.spark.util
* JavaSerializer, KryoSerializer -> org.apache.spark.serializer
Merge pull request #882 from mateiz/package-rename

Rename spark package to org.apache.spark