mangadex: r18 property support, add title during json, add [END] tag (#323)

* mangadex: r18 property support

* removed log statement

* fixed browse/latest not updating on property change

* clean up formatting

* Mangadex:
adds [END] tag back on final chapter.
Assign title during details parse

* move to preference-stub

* add summary

* fixed finished status

lib/preference-stub/src/main/java/eu/kanade/tachiyomi/source/ConfigurableSource.java

@@ -0,0 +1,13 @@
+package eu.kanade.tachiyomi.source;
+
+import android.support.v7.preference.PreferenceScreen;
+
+/**
+ * Created by Carlos on 5/7/2018.
+ */
+
+public interface ConfigurableSource {
+
+    void setupPreferenceScreen(PreferenceScreen screen);
+
+}