Added flag --install-globus-online

source the esg-globus script and calls setup_globus_online
This does the job of Neill's original install_mkproxy.sh file
(http://www.mcs.anl.gov/~neillm/esg/install_mkproxy.sh)

Additionally it asks for globus online userid and password
and enables globus online interaction.

READ:
http://www.mcs.anl.gov/~blau/ESGF/ESGF_portal_configuration_for_GO