ODK Tables Repository Name Fix

For the very few people who might be playing with the unreleased ODK
Tables, this message is for you. The rest of you please ignore.

The ODK Tables Hg repository on the ODK google code site was changed
from "spreadsheet" to "tables" to match the repository name to the
tool name. The old spreadsheet repository has been disabled; therefore
to access the code you will need to point to the renamed "tables"

We hopefully will have a preview release of ODK Tables in a couple of
months so stay tuned.