Assist users with installation of FR 2

FR2 has traditionally required a manual install process which was error prone and confusing for some folk.

This commit introduces and Ansible based installer which should fully automate both a WAR and Developer focused install of FR2 onto a fresh CentOS 6.5 VM.
Fix formatting error for README markdown
Overzealous .gitignore excluded sub directory

roles/federationation registry should have been pushed to Github but was accidently ignored.
Make .gitignore more specific
Add missing instruction to README
Merge pull request #179 from ausaccessfed/feature/#179-automate-fr2-install

Automate FR2 install