[#9] Close all opened files
[#9] Close all opened files

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