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LRU cache implementation for Python 2.7
Ported from http://code.activestate.com/recipes/578078/ and simplified for our
use (only support maxsize > 0 and positional arguments).
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namedtuple( t update_wrapper( t RLockt CacheInfot hitst missest maxsizet currsizeid c s � f d � } | S( s� Least-recently-used cache decorator.
Arguments to the cached function must be hashable.
See: http://en.wikipedia.org/wiki/Cache_algorithms#Least_Recently_Used
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