Update pom to allow SystemML to be used as a library

Allow a user to use SystemML as a Java-style library using maven coordinates, such as:

<dependency>
	<groupId>org.apache.systemml</groupId>
	<artifactId>systemml</artifactId>
	<version>1.0.0-incubating-SNAPSHOT</version>
</dependency>

Currently additional dependencies need to be manually added. Ideally a user can add a single systemml dependency to the user's project's pom without adding additional dependencies.