add a macro for ELB DNS out.
some exprimental modifications for setting up a shared S3 bucket for FS-like concurrent access
move git repo stuff for puppet into main params, and rename.
update docs based on param rename
Merge branch 'master' of github.com:huit/nepho
update based on params rename
moved into now standard place these new snippets
Pulling in Rob's work on fixing GitRepo param

Conflicts:
	nepho/data/deployments/mediawiki.yaml