[maven-release-plugin] prepare for next development iteration
Use 0.3.5 of the parent pom. Inherit the release plugin config.
Add Scala to the enumeration. The .js file is already here
Update Prettify (pretty print)

Deprecate duplicate resource references
Revert CodeBehavior#lineNumbers to be false as before. I've set it to true just for testing
Allow <xmp> as a tag for Code - it works great for highlighted labels
Use prettify.js instead of run_prettify.js.

If custom skin is needed then it is easy the application developer to contribute it explicitly
Fixes #373