Update the AMI info
add deployment to docs, update install pages accordingly

Also added glossary entries for dev/staging/production.
The deployment text is from doc/DEPLOY.md which will can be removed
if this goes live into code.alaveteli.org
add setting STAGING_SITE to dev/staging/production defs

this sets the production environment in Rails, nice to have this documented now :-)
tidy up wording
clarifications to deploy page
fix title error (Installing, not Deploying!)
insert missing word
copyedit: remove unclear 'However'
explicit link to installation from deploy page
add Capistrano to the glossary
Update links.
Remove comment about micro.
Link markup, typos
Typo
Merge branch 'gh-pages-new-ami' into gh-pages
We don't need the release manager's view here.
Add a google custom search page.

We should migrate this to a mysociety account once we are on google apps
- it's created by my personal google account.
Merge branch 'gh-pages-search' into gh-pages
Merge branch 'gh-pages-less-translation-info' into gh-pages
Refer to docs, not wiki, for production best practice notes.