upgrade to Spark 1.3.1

seems smooth, but a couple old jackson deps needed excluding

fixes #665

pom.xml

@@ -19,7 +19,7 @@
   <properties>
     <java.version>1.7</java.version>
     <avro.version>1.7.6</avro.version>
-    <spark.version>1.2.0</spark.version>
+    <spark.version>1.3.1</spark.version>
     <parquet.version>1.6.0rc4</parquet.version>
     <!-- Edit the following line to configure the Hadoop (HDFS) version. -->
     <hadoop.version>2.2.0</hadoop.version>
@@ -473,6 +473,16 @@
         <artifactId>aws-java-sdk</artifactId>
         <version>1.7.5</version>
         <scope>provided</scope>
+        <exclusions>
+          <exclusion>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+          </exclusion>
+          <exclusion>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+          </exclusion>
+        </exclusions>
       </dependency>
       <dependency>
         <groupId>org.apache.httpcomponents</groupId>