Some more stuff about LDAP

Found some more stuff on my second run which you have to do when you setup the app
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')
Tweaked Lighthouse & Campfire placeholders & labels
Add transparency to gtalk_inactive; crunch other images to reduce filesize.
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
adding missing url's for notification's services
Link to correct source path and file
update debugger gem

The previous version doesn't work with 1.9.3-p286.
fix indentation
removed unused assignment
remove duplication
use methods with memoization instead of temporary instance vars
make apps comparable
call super instead of read_attribute