[SPARK-1986][GraphX]move lib.Analytics to org.apache.spark.examples

to support ~/spark/bin/run-example GraphXAnalytics triangles
/soc-LiveJournal1.txt --numEPart=256

Author: Larry Xiao <xiaodi@sjtu.edu.cn>

Closes #1766 from larryxiao/1986 and squashes the following commits:

bb77cd9 [Larry Xiao] [SPARK-1986][GraphX]move lib.Analytics to org.apache.spark.examples

graphx/src/main/scala/org/apache/spark/graphx/lib/Analytics.scala → examples/src/main/scala/org/apache/spark/examples/graphx/Analytics.scala

@@ -15,12 +15,13 @@
  * limitations under the License.
  */
 
-package org.apache.spark.graphx.lib
+package org.apache.spark.examples.graphx
 
 import scala.collection.mutable
 import org.apache.spark._
 import org.apache.spark.storage.StorageLevel
 import org.apache.spark.graphx._
+import org.apache.spark.graphx.lib._
 import org.apache.spark.graphx.PartitionStrategy._
 
 /**

examples/src/main/scala/org/apache/spark/examples/graphx/LiveJournalPageRank.scala

@@ -20,7 +20,7 @@ package org.apache.spark.examples.graphx
 import org.apache.spark.SparkContext._
 import org.apache.spark._
 import org.apache.spark.graphx._
-import org.apache.spark.graphx.lib.Analytics
+import org.apache.spark.examples.graphx.Analytics
 
 /**
  * Uses GraphX to run PageRank on a LiveJournal social network graph. Download the dataset from