FIX: fix some problems about compile failed

1. JDK6 not support Integer.compile(int, int), so we use Integer.valueOf(int).compareTo(Integer.valueOf(int))

2. in com.kylinolap.job.hadoop.cube.NewBaseCuboidMapper, it imports org.eclipse.jdt.internal.core.Assert.  but in pom.xml, org.eclipse.jdt dependency missed!