Changes:

- Add a new cache to store library covers without relying on Glide's cache, making sure they are always available.
- Use Observable's defer instead of create in NetworkHelper.
- Fix Kissmanga showing only one genre.

app/src/main/java/eu/kanade/mangafeed/injection/module/DataModule.java

@@ -7,6 +7,7 @@ import javax.inject.Singleton;
 import dagger.Module;
 import dagger.Provides;
 import eu.kanade.mangafeed.data.cache.CacheManager;
+import eu.kanade.mangafeed.data.cache.CoverCache;
 import eu.kanade.mangafeed.data.chaptersync.ChapterSyncManager;
 import eu.kanade.mangafeed.data.database.DatabaseHelper;
 import eu.kanade.mangafeed.data.download.DownloadManager;
@@ -38,6 +39,12 @@ public class DataModule {
         return new CacheManager(app);
     }
 
+    @Provides
+    @Singleton
+    CoverCache provideCoverCache(Application app) {
+        return new CoverCache(app);
+    }
+
     @Provides
     @Singleton
     NetworkHelper provideNetworkHelper() {