Rewrite sources. Implement Batoto and Kissmanga

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -18,6 +18,7 @@ import eu.kanade.tachiyomi.data.database.models.Category
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.data.source.SourceManager
+import eu.kanade.tachiyomi.data.source.base.OnlineSource
 import eu.kanade.tachiyomi.ui.main.MainActivity
 import eu.kanade.tachiyomi.util.*
 import rx.Observable
@@ -288,9 +289,8 @@ class LibraryUpdateService : Service() {
      * @return a pair of the inserted and removed chapters.
      */
     fun updateManga(manga: Manga): Observable<Pair<Int, Int>> {
-        val source = sourceManager.get(manga.source)
-        return source!!
-                .pullChaptersFromNetwork(manga.url)
+        val source = sourceManager.get(manga.source) as? OnlineSource ?: return Observable.empty()
+        return source.fetchChapterList(manga)
                 .map { syncChaptersWithSource(db, it, manga, source) }
     }