rfe: fetch the latest version of Kotlin from Maven

[delabassee]

Right now, the Kotlin version is hardcoded in the generated pom.xml. The CLI should be updated to fetch the latest stable version number from http://search.maven.org/solrsearch/select?q=g:%22org.jetbrains.kotlin%22a:%22kotlin-stdlib%22&rows=1&wt=json and generate the pom accordingly.