Updated README with request for contributors.
Updated README with request for contributors.

stephskardal/rails_admin_import,contratadome/rails_admin_import,drmohundro/rails_admin_import,monkbroc/rails_admin_import,MaksimBurnin/rails_admin_import,contratadome/rails_admin_import,monkbroc/rails_admin_import,stephskardal/rails_admin_import,contratadome/rails_admin_import,stephskardal/rails_admin_import,monkbroc/rails_admin_import,MaksimBurnin/rails_admin_import,drmohundro/rails_admin_import,MaksimBurnin/rails_admin_import