Propagate equal, equalIsNatural in Order methods; use fewer comparisons in toScalaOrdering.
Faster map equality path; short-circuit map order based on size.
Don't iteratively call tail on IndexedSeqs, Vectors when ordering.  Short-circuit with length.
updated SBT plugins
Merge pull request #263 from S11001001/topic/less-order-indirection

Less order indirection