Bump download URLs to 2.10.3.
Suggest Slick instead of Scala Query for DB access.

It seems that Scala Query isn't developed anymore, and it's sucessor
is the Slick project (and it also supports Scala 2.10, so it seems a
good recommendation for this tutorial :-)

Slicks provides interfaces to query using "raw SQL" and also has some
DBIx::Class-like capabilities.
Merge pull request #9 from brunobuss/suggest-slick-instead-of-scala_query

Suggest Slick instead of Scala Query