Add support for NSIndexSet #48
Description
yay or nay?
Those methods would make sense for NSIndexSet:
- ASTAll
- ASTAny
- ASTDifference
- ASTEach
- ASTEmpty
- ASTFilter
- ASTFind
- ASTHead
- ASTIntersection
- ASTMap
- ASTMin
- ASTMax
- ASTReduce
- ASTReject
- ASTSize
- ASTTail
- ASTUnion
- ASTWithout