[#6] Small refactoring on Resource's data loading
[#6] Small refactoring on Resource's data loading

okfn/datapackage-model-py,datapackages/datapackage-py,okfn/datapackage-py,okfn/datapackage-py,sirex/datapackage-py,datapackages/datapackage-py,okfn/datapackage-model-py,sirex/datapackage-py