Destroy magic numbers

app/src/main/res/anim/fragment_fade_in.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <alpha
 	xmlns:android="http://schemas.android.com/apk/res/android"
-	android:duration="210"
+	android:duration="@integer/fade_in_duration"
 	android:fromAlpha="0.0"
 	android:toAlpha="1.0"  />

app/src/main/res/anim/fragment_fade_out.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <alpha
 	xmlns:android="http://schemas.android.com/apk/res/android"
-	android:duration="90"
+	android:duration="@integer/fade_out_duration"
 	android:fromAlpha="1.0"
 	android:toAlpha="0.0"  />

app/src/main/res/values/integers.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-
 	<integer name="manga_badge_max_character_count">3</integer>
+	<integer name="fade_in_duration">210</integer>
+	<integer name="fade_out_duration">90</integer>
 </resources>