hBase example

This pull request provides an example of creating a NewHadoopRDD based on an hBase table. The HBaseTest class has a "main" method that takes two arguments: (1) the first SparkContext configuration parameter and (2) the hBase table name in String format. If the table does not already exist, the example will create it.

hBase resources are also added to SparkBuild.scala under the section for the examples project.

I wrote this code myself and I'm the copyright holder. I license it to the Spark/Mesos project under the project's license (BSD).