Issue phonegap#146 iconColor does not set icon background on Android

README.md

@@ -67,7 +67,7 @@ Parameter | Description
 `options.android` | `JSON Object` Android specific initialization options.
 `options.android.senderID` | `String` Maps to the project number in the Google Developer Console.
 `options.android.icon` | `String` Optional. The name of a drawable resource to use as the small-icon.
-`options.android.iconColor` | `String` Optional. Sets the background color of the small icon. [Supported Formats](http://developer.android.com/reference/android/graphics/Color.html#parseColor(java.lang.String))
+`options.android.iconColor` | `String` Optional. Sets the background color of the small icon on Android 5.0 and greater. [Supported Formats](http://developer.android.com/reference/android/graphics/Color.html#parseColor(java.lang.String))
 `options.android.sound` | `Boolean` Optional. If `true` it plays the sound specified in the push data or the default system sound. Default is `true`.
 `options.android.vibrate` | `Boolean` Optional. If `true` the device vibrates on receipt of notification. Default is `true`.
 `options.android.clearNotifications` | `Boolean` Optional. If `true` the app clears all pending notifications when it is closed. Default is `true`.
@@ -219,7 +219,7 @@ In order to get a better user experience you can specify an alternate icon and b
 
 Where *icon* is the name of an image in the Android *drawables* folder. Writing a hook to describe how to copy an image to the Android *drawables* folder is out of scope for this README but there is an [excellent tutorial](http://devgirl.org/2013/11/12/three-hooks-your-cordovaphonegap-project-needs/) that you can copy.
 
-*iconColor* is one of the supported formats #RRGGBB or #AARRGGBB or one of the following names: 'red', 'blue', 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow', 'lightgray', 'darkgray', 'grey', 'lightgrey', 'darkgrey', 'aqua', 'fuchsia', 'lime', 'maroon', 'navy', 'olive', 'purple', 'silver', 'teal'.
+*iconColor* is one of the supported formats #RRGGBB or #AARRGGBB or one of the following names: 'red', 'blue', 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow', 'lightgray', 'darkgray', 'grey', 'lightgrey', 'darkgrey', 'aqua', 'fuchsia', 'lime', 'maroon', 'navy', 'olive', 'purple', 'silver', 'teal'. *iconColor* is supported on Android 5.0 and greater.
 
 Please follow the [Android icon design guidelines](https://www.google.com/design/spec/style/icons.html#) when creating your icon.