Add support for classifier in Maven/Aether repository handler

Trying to deploy an artifact having this dependency:

<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.2.2</version>
<classifier>jdk15</classifier>
</dependency>

The artifact installation fails with:

class org.sonatype.aether.transfer.ArtifactNotFoundException: Could not find artifact net.sf.json-lib:json-lib:jar:2.2.2 in maven-central (http://repo1.maven.org/maven2/)