Shorten source code lines a bit.

This makes it more accessible in Activator's multi-column UI.
Add "Running Queries" section with code in InvokerMethods.scala.

This is an improved and extended version of "UseInvoker" from
slick-examples.
Link to other Slick templates
Merge pull request #4 from typesafehub/wip/2.0-improvements

Some improvements to Hello Slick, still targeting 2.0