hpc: .gitignore (new file); README.md (modified); login_node_monitor/.foolinggit (new file); login_node_monitor/README.txt (new file); login_node_monitor/ln_monitor-settings.sh (new file); login_node_monitor/ln_monitor.sh (new file); post2twitter/README.md (new file); post2twitter/post2twitter.php (new file); post2twitter/post2twitter.sh (new file); post2twitter/post2twitter.txt (new file)