Add 'git submodule' commands to setup.sh

The git submodules are needed to properly set up the Vim plugins, and
since I always forget to do this, automatically run the 'git submodule'
commands necessary at setup time.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Add some initial irssi configuration

This commit adds some initial configuration of irssi. A basic config
file was added to set up my nick, and automatically connect to a few
channels. In addition, the cap_sasl.pl script was added which is used
for authenticating my nick with the nickserv.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Change GitHub key file to use 'prakashsurya'

This is a simple change to update the git config file to reflect the
username change from 'Prakash-Surya' to 'prakashsurya'. The identity
file should be renamed to work properly now. Also, the old entry for the
'dunecn' user was removed as this account hasn't been used in years.

Signed-off-by: Prakash Surya <surya1@llnl.gov>