added support for patterns "p" and "c" from log4j, respectively equals to "level" and "logger" in logback

- added a test case to be sure that the LoggerContext doesn't get flooded with messages when no appenders are configured
related bug: id=2

- spelling fix on documentation.xml

- We don't allow unsubscribed users to post, so there is no point in 
  including a mailto: link

- updated last source code snippet
- other minor fixes

- added some comments

- modified links in repos.xml
- minor other changes

- modified name of main page
- corrected download page