Update Ceylon sample file

See ceylon/ceylon-spec#585 for the new annotation syntax and ceylon/ceylon-spec#574 for the new string interpolation syntax.
Merge pull request #1570 from lucaswerkmeister/patch-1

Update Ceylon sample file
Adds samples for the clean programming language
Merge pull request #1575 from Jaxan/clean-samples

Adds samples for the clean programming language
Merge branch 'master' into 1515-local