flag removed from re.sub(), support for python 2.6
flag removed from re.sub(), support for python 2.6

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