Add chapter loader, drop non seamless mode

app/src/main/java/eu/kanade/tachiyomi/util/RetryWithDelay.kt

@@ -0,0 +1,22 @@
+package eu.kanade.tachiyomi.util
+
+import rx.Observable
+import rx.functions.Func1
+import java.util.concurrent.TimeUnit.MILLISECONDS
+
+class RetryWithDelay(
+        private val maxRetries: Int = 1,
+        private val retryStrategy: (Int) -> Int = { 1000 }
+) : Func1<Observable<out Throwable>, Observable<*>> {
+
+    private var retryCount = 0
+
+    override fun call(attempts: Observable<out Throwable>) = attempts.flatMap { error ->
+        val count = ++retryCount
+        if (count <= maxRetries) {
+            Observable.timer(retryStrategy(count).toLong(), MILLISECONDS)
+        } else {
+            Observable.error(error as Throwable)
+        }
+    }
+}