LOGBACK-943 Allow for unlimited nested variable resolution.
starting work on next release
update links to mailing lists
Merge branch 'logback-943' of git://github.com/ericdahl/logback into ericdahl-logback-943
add circular reference detection in default part of variables
minor edits
added CLA for Chetan
Merge branch 'logback-942' of git://github.com/ericdahl/logback into ericdahl-logback-942
use latches to improve test speed
minor change