Refactor the maven upload build stuff

This also adds the required javadoc jars

dexlib2/accessorTestGenerator/build.gradle

@@ -36,8 +36,4 @@ dependencies {
     compile 'org.antlr:ST4:4.0.7'
 
     testCompile 'junit:junit:4.6'
-}
-
-// this is a test-only project that we don't need to upload to maven
-signArchives.enabled = false
-uploadArchives.enabled = false
+}