Merge pull request #92 from plusCubed/master

Woops, re-add md_selector for dark theme

library/src/main/res/values/styles.xml

@@ -10,6 +10,7 @@
     <style name="MD_Dark" parent="android:Theme.Dialog">
         <item name="md_divider">@color/md_divider_white</item>
         <item name="md_btn_selector">@drawable/md_btn_selector_dark</item>
+        <item name="md_selector">@drawable/md_selector_dark</item>
         <item name="android:windowFrame">@null</item>
         <item name="android:windowBackground">@android:color/transparent</item>
         <item name="android:windowContentOverlay">@null</item>