Added javax.activation as a dependency (#129).

pom.xml

@@ -189,6 +189,11 @@
 			<artifactId>jaxb-api</artifactId>
 			<version>2.3.0</version>
 		</dependency>
+		<dependency>
+			<groupId>com.sun.activation</groupId>
+			<artifactId>javax.activation</artifactId>
+			<version>1.2.0</version>
+		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.jaxrs</groupId>
 			<artifactId>jackson-jaxrs-json-provider</artifactId>