allow passing file caching path from outside
allow passing file caching path from outside

rsr5/chefspec,bheuvel/chefspec,Thalagyrt/chefspec,mcoolive/chefspec,ranjib/chefspec,jtimberman/chefspec,gsavage/chefspec,chefspec/chefspec,ranjib/chefspec,sethvargo/chefspec,h4ck3rm1k3/chefspec,aspiers/chefspec,rsr5/chefspec,jkeiser/chefspec,shanethehat/chefspec,375gnu/chefspec,jtimberman/chefspec,lamont-granquist/chefspec,coderanger/chefspec,gsavage/chefspec,mcoolive/chefspec,shanethehat/chefspec,jkeiser/chefspec,coderanger/chefspec,aspiers/chefspec,bheuvel/chefspec,sethvargo/chefspec,chefspec/chefspec,oldirty/chefspec,375gnu/chefspec,oldirty/chefspec,h4ck3rm1k3/chefspec,lamont-granquist/chefspec,Thalagyrt/chefspec