new feature from Geo::Hash::XS#3

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yappo wants to merge 2 commits intoAndyA:masterfrom

yappo:feature-geo_hash_xs

Commits on Sep 6, 2012

implemented of adjacent from Geo::Hash::XS
yappo
committed

Commits on Sep 7, 2012

implemented of neighbors from Geo::Hash::XS
yappo
committed