user expects to see requirements broken down by pages

    -  adding requirements pagination to controller/view
    -  adding parent field to requirements, fix seeds
    -  custom collection route for requirements paginate
    -  adding title attribute for pagination links
    -  redirect to correct page on proofs create/update
    -  use all requirements to generate pdf
    -  remove first, prev, next and last paginate links
    -  restyle, progress bar vs pie chart
    -  extracting helper for requirements progress bar
    -  tweaked kaminari paginator to use pagination-plain
    -  adding rake task to fill parent field