Merge pull request #41 from matthayes/master

Test cleanup
Merge pull request #42 from matthayes/master

Make Quantile output schemas consistent with StreamingQuantile
README update
Add version to javadoc title
Exclude IntVAR, DoubleVAR, etc. from javadoc

[ci skip]
Consolidate tests
Renamed datafu.pig.bags.sets to datafu.pig.sets
Remove AliasBagFields

This isn't needed anymore now that nested foreach is possible.  Simply perform FOREACH on a bag and change the aliases.
Rename TimeCount to SessionCount, move to sessions package
Merge branch 'master' of github.com:linkedin/datafu
Add SessionCount unit test