Update README.md

Described the layout philosophy
commit
Added a UI role, updated the users and groups to enable sagrid.ac.za VO
Merge branch 'master' of https://github.com/AAROC/ansible-for-grid
adding CVMFS config files pulled in from ZA-UJ
Changed the nagios host certificate
added argus server host key
Added the ARGUS role.

Minor spelling errors in some playbooks.
added an iptables template for site-bdii
minor modification to directory layout
closes #17
changed backup instance of ncg to false for production ngi.nagios configuration
added facter to managed node requirements
Update main.yml

Updated firewall ports necessary for WMS. was missing 9000 and 8443
Update za-meraka
Update za-meraka

removed some passwords (they've been changed)
added a ZA-TLABS directory in the sites folder
Update nagios-servers

Added a JOBSUBMIT_WN_SE_REP parameter according to Esteban from NGI_Ibergrid.
Update site-info.def.j2

updated with JOBSUBMIT_WN_SE_REP parameter in nagios.
Slight issue still with host-key configuration, but hey