GUACAMOLE-96: Add TOTP generator implementation based on reference implementation from IETF.

extensions/guacamole-auth-totp/pom.xml

@@ -154,6 +154,21 @@
             <scope>provided</scope>
         </dependency>
 
+        <!-- Guava - Utility Library -->
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>18.0</version>
+        </dependency>
+
+        <!-- JUnit -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
 </project>