Merge pull request #4 from rjhall/develop

Tracing Inputs through the flow
Remove unused import that breaks test build
Add Etsy local filesystem-repo with hard-coded paths that points to the algebird and chill we require
Reimplement average to use aggregate/Averager rather than mapPlusMap/AveragedValue
Immense work-around to add what I think should be simple: an optional setting and a resolver conditioned on this setting

Note that for me, the etsyFSRepoPath must be provided and point to our local filesystem repository to find the correct version of algebird
Additionally point the publish target at the Etsy filesystem repository, if a path is provided
Add set documentation
Use <<= in place of <++= in order to use Option idiomatically and eliminate an unnecessary helper function
Remove warning by allowing caller to name resolver; same resolver could be used in both resolvers and publishTo, but it is currently a function of the etsyFSRepoPath setting when those settings are defined
Merge pull request #6 from mrwalker/develop

First commits
Merge branch 'develop' of https://github.com/etsy/scalding into config-fix

Conflicts:
	project/Build.scala