* First draft of instrumenting Spring Security
* Create events based on Authentication not SecurityContext
* Simplifying security config
* Checkstyle reformat
* Create DocumentedSpan and EventValue for Spring Security instrumentation
* Adding spring-security-bom to ensure the right dependencies are used.
* TracingSecurityContextChangedListenerTests
* Adding integration tests
* Deleting spring-cloud-sleuth-sample-security
* Checkstyle, license, javadoc
* Inlining SleuthSecuritySpan methods
* Deleting javadoc links from DocumentedSpan
* Updating auto-generated docs
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