gui: Implement route deletion

Change-Id: I8b08a1545c22095894f7285500adfde94d99830c
Refs: #3442
diff --git a/build.gradle b/build.gradle
index b510b10..9c1a198 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.0'
+        classpath 'com.android.tools.build:gradle:2.1.2'
         classpath 'net.named-data.playground:play-publisher:1.2.0-2-SNAPSHOT'
 
         // NOTE: Do not place your application dependencies here; they belong