[Android] Update android gradle build version (#396)

Change to jCenter because mavenCentral does not have the latest version of the package

android/build.gradle

 
 buildscript {
     repositories {
-        mavenCentral()
+        jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.0.0'
+        classpath 'com.android.tools.build:gradle:2.3.3'
     }
 }