[maven-release-plugin] prepare for next development iteration
Making PMD happy
(cherry picked from commit 9a6e039)
Fixed an issue where null arguments to a logging event and null values in the MDC caused a NullPointerException due to Guava's
strict attitude to nulls. Null arguments now appear as Optional.absent() and null values in the MDC as the String "null".
[maven-release-plugin] prepare release slf4j-test-1.0.1
Further work on making SLF4J test available for Java 6
Merging in changes from 1.0.1 release
Fixing compile issues when compiling against Java 1.6