add Hash#rec_merge to complement #rec_merge!
add Hash#rec_merge to complement #rec_merge!

kirs/will_paginate,maxwellscott/sample_app,ThiagoLelis/will_paginate,betterplace/will_paginate,lloydmeta/will_paginate,CloudVLab/will_paginate,jonatack/will_paginate,jonatack/will_paginate,mislav/will_paginate,pcreux/will_paginate,ThiagoLelis/will_paginate,CloudVLab/will_paginate,sideci-sample/sideci-sample-will_paginate,solanolabs/will_paginate,BenjamH/will_paginate,envato/will_paginate,mislav/will_paginate,xingxing/will_paginate,georgkreimer/will_paginate,lloydmeta/will_paginate,kirs/will_paginate,poporul/will_paginate,notonthehighstreet/will_paginate,solanolabs/will_paginate,sideci-sample/sideci-sample-will_paginate,BenjamH/will_paginate,maxwellscott/sample_app,poporul/will_paginate,yogo/will_paginate,xingxing/will_paginate,leandronunes/will_paginate,rayvinly/will_paginate,Hobo/hobo_will_paginate,streamio/will_paginate,bouchard/will_paginate,betterplace/will_paginate,notonthehighstreet/will_paginate,envato/will_paginate