Added ability to log via slf4j in cord-gui.

Change-Id: I264c2d58357b50184b3b4b77ad679c89e1e121a2
diff --git a/apps/demo/cord-gui/pom.xml b/apps/demo/cord-gui/pom.xml
index f644409..e7a9212 100644
--- a/apps/demo/cord-gui/pom.xml
+++ b/apps/demo/cord-gui/pom.xml
@@ -55,10 +55,17 @@
         </dependency>
 
         <dependency>
-            <groupId>com.google.sitebricks</groupId>
-            <artifactId>slf4j</artifactId>
-            <version>0.8.3</version>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.7</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-jdk14</artifactId>
+            <version>1.7.7</version>
+        </dependency>
+
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>