Bumping Podfile.lock
Improve nil-handling of ASTDifference
Improve nil-handling of ASTEach
Improve nil-handling of ASTFilter
Improve nil-handling of ASTFind
Improve nil-handling of ASTGroup
Improve nil-handling of ASTHead
Improve nil-handling of ASTIntersection
Improve nil-handling of ASTMap
Improve nil-handling of ASTMin & ASTMax
Improve nil-handling of ASTPluck
Improve nil-handling of ASTReduce
Improve nil-handling of ASTReject
Improve nil-handling of ASTTail
Improve nil-handling of ASTUnion
Minor documentation changes
Whitespace

@robb, why did you decide to box the `NSComparisonResult` in an
`NSNumber`?
Remove unnecessary `nil` checks
Merge pull request #5 from robb/nil-handling

Improving nil handling