Only generate JavaDoc for public classes and methods

Author: rubengees

library/build.gradle

@@ -27,6 +27,7 @@ task sourcesJar(type: Jar) {
 
 task javadoc(type: Javadoc) {
     failOnError false
+    options.memberLevel = JavadocMemberLevel.PUBLIC
     source = android.sourceSets.main.java.sourceFiles
     classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
     classpath += configurations.compile