Added javax.servlet dependency to support the WebHook.

pom.xml

@@ -90,6 +90,11 @@
         	<artifactId>jersey-json</artifactId>
         	<version>${jersey.version}</version>
         </dependency>
+        <dependency>
+        	<groupId>javax.servlet</groupId>
+        	<artifactId>javax.servlet-api</artifactId>
+	        <version>3.0.1</version>
+		</dependency>
        	<dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>