Edited the RTL use case

Revised Egyptian referendum results example & added pictures (embedded
figures). Removed the Hebrew example as the data file did not match the
web-page links … and it didn’t appear to add anything over the Arabic
example.
update to include adding default values
tightened up requirement for default data
amended RTL use case following ivan's comment
[metadata][s]: tweak issue 1 example as per chat with jeni.
Merge branch 'gh-pages' of github.com:w3c/csvw into gh-pages