Fix for #85, clone of undefined object in minimizeQueryAST

[jordanh]

No description provided.

[coveralls]

Coverage remained the same at 85.427% when pulling 2391b15 on jordanh:print-minimal-query-fix into 8c02ba4 on mattkrick:master.

[mattkrick]

Thanks! I hate writing mutative code, but i really don't see a clean way of doing that functionally. The best I can do is wrap the mutative, recursive code in a functional wrapper & expose that...