Update grails-shell-cli to correctly handle mavenCentral and Apache Snapshot Repo

[jamesfredley]

Issue description

It currently fails on mavenCentral, even though the Apache Snapshot Repo was added and available (theory)

grails> create-app Test1
Resolving dependencies..
| Error Command [create-app] error: org.eclipse.aether.resolution.DependencyResolutionException: The following artifacts could not be resolved: org.apache.grails.profiles:web:jar: (absent): Could not find artifact org.apache.grails.profiles:web:jar: in mavenCentral (https://repo1.maven.org/maven2) (Use --stacktrace to see the full trace)