Include cnxml7 resource files in setup.py package_data

The resource directory was not included in the installed package when
using "sudo python setup.py install"
Fix namespace problem when trying to upgrade cnxml
Insert the updated cnxml into the database

The code was inserting the same cnxml into the database as
index_auto_generated.cnxml.  "source" in
cnxupgrade/upgrades/cnxml7/main.py wasn't actually used.
Add --filename for cnx-upgrade to_html

This is the filename of the cnxml source in the module_files table.  It
is index_auto_generated.cnxml by default.  index_auto_generated.cnxml is
generated by cnx-upgrade cnxml7.
Merge pull request #30 from Connexions/fix-cnxml-upgrade

Fix cnxml upgrade