Corrected Maven build. SDK Version is upgraded to 3.1

controltower-android/pom.xml

@@ -32,7 +32,7 @@
             <plugins>
                 <plugin>
                     <groupId>com.jayway.maven.plugins.android.generation2</groupId>
-                    <artifactId>android-maven-plugin</artifactId>
+                    <artifactId>android-maven-plugin</artifactId>	
 		    <version>3.3.0</version>
                     <extensions>true</extensions>
                 </plugin>
@@ -67,7 +67,7 @@
         <dependency>
 	  <groupId>com.google.android</groupId>
 	  <artifactId>android</artifactId>
-	  <version>2.3.3</version>
+	  <version>3.1</version>
 	  <scope>provided</scope>
         </dependency>
 	<dependency>