require core_ext before trying to use `include_method?` in `enable_actionpack`
require core_ext before trying to use `include_method?` in `enable_actionpack`

closes #1

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