Corrected Maven build. SDK Version is upgraded to 4.0

controltower-android/pom.xml

@@ -67,9 +67,9 @@
         <dependency>
 	  <groupId>com.google.android</groupId>
 	  <artifactId>android</artifactId>
-	  <version>3.1</version>
+	  <version>4.0.1.2</version>
 	  <scope>provided</scope>
-        </dependency>
+	</dependency>
 	<dependency>
 	    <groupId>com.codeminders</groupId>
 	    <artifactId>javadrone-api</artifactId>