Artifact classpath

Creating a classpath for a simple set of artifacts can be done by passing the artifact coordinates to the task:

saker.java.compile(
	SourceDirectories: src,
	ClassPath: saker.maven.classpath([
		"junit:junit:4.12",
		"org.slf4j:slf4j-api:1.7.19"
	])
)

In the above we create a classpath that references the junit:junit:4.12 and org.slf4j:slf4j-api:1.7.19 artifacts. Note that the dependencies of the artifacts are not resolved.