Changelog

• Add support for NSOrderedSet
• Make ASTPluck accept id<NSFastEnumeration>
• Pass through nil where appropriate
• Add ASTDefaults, ASTExtend
• Add ASTFlatten
• Add ASTIndexOf
• Add ASTAll and ASTAny
• Add ASTSize
• Add ASTWithout
• ASTGroupBy now takes key paths
• Add ASTPick
• Add ASTIndexBy
• Rename ASTGroup to ASTGroupBy
• Remove ASTLift and ASTPartial
• Add a Mac Framework