- removing unused stylesheets directory

- refactored the IncludeAction for clarity
- IncludeActionTest has been enhanced to check for bug 129

- refactored the IncludeAction for clarity
- IncludeActionTest has been enhanced to check for bug 129

  The secondary map is no longer supported.

  http://bugzilla.slf4j.org/show_bug.cgi?id=66 for more details.

  In short, the caller data was not correctly extracted when going
  through log4j-over-slf4j.

The defensive code compensating for the bug in 0.9.8 until 0.9.9 is released was not merged because it is a workaround hiding the true logic of the code.
 
  void buildResponseHeaderMap() {
    if (responseHeaderMap == null) {
      if(serverAdapter != null) {     <-- ---- not merged
        responseHeaderMap = serverAdapter.buildResponseHeaderMap();
      } else {
        responseHeaderMap = new HashMap<String, String>();
      }
     }
   }

Now, only Context's have a property map. A number of classes has to change to reflect this change.

- first-step to using JUnit 4.

 bug #104  http://bugzilla.qos.ch/show_bug.cgi?id=104

  http://bugzilla.qos.ch/show_bug.cgi?id=110

exceptions on the list maintained by ConcurrentModificationException, as shown below

java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
        at java.util.AbstractList$Itr.next(AbstractList.java:420)
        at ch.qos.logback.core.util.StatusPrinter.print(StatusPrinter.java:47)
        at ch.qos.logback.core.util.StatusPrinter.print(StatusPrinter.java:38)
        at ch.qos.logback.audit.server.AuditServerTest.testUnreachable(AuditServerTest.java:137)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        
This can happen if multiple thread access BasicStatusManager simultaneously.

see also http://mojo.codehaus.org/retrotranslator-maven-plugin/index.html

http://bugzilla.qos.ch/show_bug.cgi?id=96

- better docs in appenders.html

- updates to documentation
- replaced slf4j-api-1.4.0.jar with slf4j-api-1.4.3.jar