Added cache backend#22

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arescope wants to merge 3 commits intojazzband:masterfrom

ThatGreenSpace:add-cache-backend

Commits on Oct 1, 2014

Added cache backend
Alberto Resco Perez
committed
Remove unused import
Alberto Resco Perez
committed

Commits on Oct 3, 2014

Added documentation
Alberto Resco Perez
committed