Add missing dependency spray-json to Maven build

core/pom.xml

@@ -71,6 +71,10 @@
       <groupId>cc.spray</groupId>
       <artifactId>spray-server</artifactId>
     </dependency>
+    <dependency>
+      <groupId>cc.spray</groupId>
+      <artifactId>spray-json_${scala.version}</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.tomdz.twirl</groupId>
       <artifactId>twirl-api</artifactId>

pom.xml

@@ -54,6 +54,7 @@
     <mesos.version>0.9.0-incubating</mesos.version>
     <akka.version>2.0.3</akka.version>
     <spray.version>1.0-M2.1</spray.version>
+    <spray.json.version>1.1.1</spray.json.version>
     <slf4j.version>1.6.1</slf4j.version>
     <cdh.version>4.1.2</cdh.version>
   </properties>
@@ -222,6 +223,11 @@
         <artifactId>spray-server</artifactId>
         <version>${spray.version}</version>
       </dependency>
+      <dependency>
+        <groupId>cc.spray</groupId>
+        <artifactId>spray-json_${scala.version}</artifactId>
+        <version>${spray.json.version}</version>
+      </dependency>
       <dependency>
         <groupId>org.tomdz.twirl</groupId>
         <artifactId>twirl-api</artifactId>