Use nucleus restartables in chapters presenter. Fix some database methods. Add swipe refresh to chapters fragment. Use Icepick library.

app/proguard-rules.pro

@@ -93,4 +93,11 @@
 
 -keep public class * extends android.support.v4.view.ActionProvider {
     public <init>(android.content.Context);
+}
+
+# Icepick
+-dontwarn icepick.**
+-keep class **$$Icepick { *; }
+-keepclasseswithmembernames class * {
+    @icepick.* <fields>;
 }