Extend Readme.md with some more LDAP auth stuff

You need to add the devise strategy to enable LDAP lookups.
Merge pull request #286 from luxflux/patch-1

Extend Readme.md with some more LDAP auth stuff
update capistrano
Some more stuff about LDAP

Found some more stuff on my second run which you have to do when you setup the app
Merge pull request #288 from luxflux/patch-2

Some more stuff about LDAP
[ci skip]
Added more contributors to 'thanks' list [ci skip]
Added note about contributors graph [ci skip]
Lighthouse Project ID is now labelled as a number (to assist users who didn't see the Readme)
HTML Placeholders should be examples of input
Bring label text similar to that of the Campfire service ('subdomain' rather than 'account')
Merge pull request #290 from theDoug/tracker-labelling

Tracker labelling
Tweaked Lighthouse & Campfire placeholders & labels
Add transparency to gtalk_inactive; crunch other images to reduce filesize.
Add transparency to gtalk_inactive; crunch other images to reduce filesize.
Merge branch 'image-optimization' of github.com:theDoug/errbit into image-optimization
Merge pull request #293 from theDoug/image-optimization

Image optimization
Reduce the padding of table content to keep rows within the main layout (issue 275)
Link to the Campfire account in the apps table, service rather than the Campfire homepage
Subdomain, not account
Merge pull request #295 from amaabca/campfire-notification-link

Campfire notification link