Bumping version numbers
Merge branch 'release/0.8.5' into develop
Make Tuple code follow typeclass pattern
Add some comments
Merge pull request #430 from twitter/feature/tuple-typeclasses

Make Tuple code follow typeclass pattern
convert Monoid to Semigroup
Merge pull request #431 from twitter/semigroupthethings

convert Monoid to Semigroup
Relax Iterable to TraversableOnce
Fixup Mappable
Make sum the same as plus in the Fields API
fix a few tests
Fix Tutorial
fix comment
Merge pull request #433 from twitter/fixsum

Merge #433
Merge pull request #432 from twitter/travonce

Merge #432
Use Long instead of Int for the counter in histogram
Merge pull request #435 from daikeshi/histogram-long-type

Merge #435
Corrent Building section in README to indicate that scalding 0.8.5 is also for 2.10
Put all scalding modules in a list view.
Add one linebreak.