switch to jdk 1.7 and added a test cases for concept Insights

Author: germanattanasio

config.properties.enc

@@ -105,8 +105,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.2</version>
 				<configuration>
-					<source>1.6</source>
-					<target>1.6</target>
+					<source>1.7</source>
+					<target>1.7</target>
 				</configuration>
 			</plugin>
 			<plugin>

pom.xml

@@ -52,7 +52,12 @@ public class ConceptInsights extends WatsonService {
      * The Constant ACCOUNT_ID. (value is "account_id")
      */
     public static final String ACCOUNT_ID = "account_id";
-
+    
+    /**
+     * The Constant CONCEPT_ID. (value is "concept_id")
+     */
+    public static final String CONCEPT_ID = "concept_id";
+    
     /**
      * The ACCOUNTS_PATH. (value is "/v2/accounts")
      */

src/main/java/com/ibm/watson/developer_cloud/concept_insights/v2/ConceptInsights.java

@@ -24,7 +24,7 @@
 public class GsonSingleton {
 
 	/** The Constant DATE_FORMAT_UTC. */
-	private static final String DATE_FORMAT_UTC = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX";
+	private static final String DATE_FORMAT_UTC = "yyyy-MM-dd'T'HH:mm:ss.SSSX";
 	/** The gson. */
 	private static Gson gson;