Change exists to protected so overriding methods can modify its value.

git-svn-id: https://outlast.svn.beanstalkapp.com/mozajik-private/trunk@304 1177bc47-7a3e-47f4-a2ea-9a189b2012c5
Readding readme.

git-svn-id: https://outlast.svn.beanstalkapp.com/mozajik-private/trunk@305 1177bc47-7a3e-47f4-a2ea-9a189b2012c5
Merge branch 'master' of https://github.com/outlast/outlast-framework