updated to hadoop-2.0.0-cdh4.2.0
If the auth setting is setting to simple in the hadoop config do not try
to authenticate. If the auth setting is set to kerberos then try and use
kerberos, otherwise raise an error.
increment version number for internal semetric release 1.3.4+sem-02
updated missing contrib files
Merge pull request #2 from mattjeffery/release-1.3.4+sem-02

Release 1.3.4+sem 02