Merged fastscroller from cabinet. Temporary fixed the wrong fab margins on KitKat and below caused by the google support design library. Added empty screens to Album Song and Artist views.

app/src/main/java/com/kabouzeid/gramophone/interfaces/OnUpdatedListener.java

@@ -0,0 +1,9 @@
+package com.kabouzeid.gramophone.interfaces;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public interface OnUpdatedListener {
+
+    void onUpdated(SelfUpdating selfUpdating);
+}

app/src/main/java/com/kabouzeid/gramophone/interfaces/SelfUpdating.java

@@ -0,0 +1,9 @@
+package com.kabouzeid.gramophone.interfaces;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public interface SelfUpdating {
+
+    void setOnUpdatedListener(OnUpdatedListener listener);
+}