Parameterize scalaz.std.map members by map subtype.
Instantiate scalaz.std.MapSub* for SortedMap.
Parameterize map syntax by map subtype.
scalaz.syntax.std.sortedMap, a MapOps instantiation.
Merge branch 'scalaz-seven' of github.com:scalaz/scalaz into topic/sorted-map-funs
Fix infinite recursion in SortedMap CanBuildFrom derivation.
Test Map instances (and later functions) generically; include SortedMap case.
Merge pull request #575 from S11001001/topic/sorted-map-funs

Instances/functions for SortedMap