Update documentation with the new changes
Update documentation with the new changes

The previous commits just introduced a lot of new modules which
were started before the documentation was merged so we need to
update the documentation to include those new modules as well.

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