Disabled building of the Ruby bindings

Since the Ruby bindings will be shipped via a gem, there's no need to build them here.
Changed directories from 0.6 to 0.7 for current release
Fixing lintian errors in the packages.
Update debian/changelog for first upload
Tweak the multi-arch config
Add comments to the lintian-overrides
Update to standards-version 3.9.5
Add lintian-override for python-depends-but-no-python-helper