Added some commments / javadoc as a Histogram
Just updated the Histogram
Fixed comments in collections/Histogram.java
Corrected incorrect bucket count details in the class javadoc
Added some comments to getMean()
javadoc updates
Added detailed comments for MultiProducerPublisher

Explains the availability flag check logic
Added detailed comments for WorkProcessor
More comments in WaitStrategy
Clarified SequenceReportingEventHandler
A couple of small javadoc updates