v1.4 - allow explicit level configuration using name prefix
Loggers loglevel can now be specified using a prefix of the logger name, for instance:
<context-param>
<param-name>webapp-slf4j-logger.org.apache.commons.level</param-name>
<param-value>info</param-value>
</context-param>
will configure the level of all org.apache.commons loggers.