Added Travis build.
Inform baton of iRODS location during the build.
Use the latest WTSI iRODS build.
Ensure that the iRODS build is unpacked in the Travis build directory.
Updated to baton 0.12.0, which supports the --with-irods configure option.

Added required Perl modules and iRODS groups.
Merge pull request #4 from keithj/devel

Added Travis build