Use older dict init for <2.7 compatibility
Use older dict init for <2.7 compatibility

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