switch to DropboxSDK 3.0.3 to ensure future compatability

enable proguard on the main app in order not to hit the DEX limit 64k

src/java/JavaFileStorageTest-AS/app/build.gradle

@@ -29,6 +29,8 @@ android {
     }
 }
 
+apply plugin: 'com.getkeepsafe.dexcount'
+
 dependencies {
     compile project(':android-filechooser')
     compile project(':JavaFileStorage')

src/java/JavaFileStorageTest-AS/build.gradle

@@ -9,7 +9,9 @@ buildscript {
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
+        classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.7.1'
     }
+
 }
 
 allprojects {