Updates to architecture page to include converged role and add new services
Change branch in installation/environments section from stacktira to icehouse
Modified examples of common config to reflect new sample user.yaml.

Updates to networking and SSL sections.
Update packages and gemcache fetch to be from stacktira.aptira.com and add "chkconfig httpd on"
Include role name and managment nic in bootstrap line
Add new section called networking, user instructions for restarting
keepalived and network services after first run, as well as disabling
GRO offload.
Merge pull request #2 from sinner-/master

Documentation updates for Icehouse