Fix documentation for metrics-log4j2
Fix log4j package
Merge pull request #645 from joschi/log4j2-docs

Fix documentation for metrics-log4j2
Add simpler constructors for log4j2.InstrumentedAppender
JmxReporter: Fixed typo in Builder javadoc
Merge pull request #647 from Turbo87/patch-1

JmxReporter: Fixed typo in Builder javadoc
Update version and github_page in documentation