Implementation of custom value object for count-min sketch data attachment. Allows for correct
merging of two or more count min sketch attachments that are stored on multiple nodes.
Renaming the field "filter" to the field "sketch" so that it is not conflated with bundle or value
filters. Updated Javadoc documentation to reflect the recommended query operations for the count
min sketch data attachment and the probabilistic counter data attachment.
Implementation of DataCountMinSketch methods that are needed for serialization and deserialization.
Working mergeable estimates from count.min.sketch data attachment.
Merge pull request #32 from mspiegel/cmsketch-merge

Add ability to merge multiple count-min sketch data attachments.