sql: Add sql namespacing

This matches the namespacing used in the boot-camp assembly [1].  We
want the cleanups from the master branch (no YAML front-matter, and
external glossary links) because the boot-camp repository doesn't yet
have any of that global stuff.

[1]: http://git.tremily.us/?p=swc-boot-camp.git;a=commit;h=d062a622e937bc3127c39fdb3ddcbc63febd5d3f

diff --git a/.gitignore b/sql/.gitignore
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diff --git a/01-select.ipynb b/sql/01-select.ipynb
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diff --git a/02-sort-dup.ipynb b/sql/02-sort-dup.ipynb
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