added new hash methods for setting byte[] values in redis. added new unit test cases for these methods.
added private static final byte[] field to jedis client class that represents a hash field 'object' for use with all serialised objects in hashes.
also removed s.out messages in test cases.
added javadocs for all hash methods
Merge pull request #20 from skibz/issue-16.1

new hash methods for handling serialised java objects in redis