Add guidelines. Add web and nosql projects to site

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595739 13f79535-47bb-0310-9956-ffa450edef68
LOG4J2-620 - Perform reconfiguration in a separate thread to prevent deadlocks.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1595741 13f79535-47bb-0310-9956-ffa450edef68