updated user preferences and tests

UserPreferences/user_preferences.android.ts

@@ -58,6 +58,13 @@ export var setNumber = function(key: string, value: number): void {
     editor.commit();
 }
 
+export var remove = function (key: string): void {
+    Common.checkKey(key);
+    var editor = sharedPreferences.edit();
+    editor.remove(key);
+    editor.commit();
+}
+
 /*
 these are commented out to be used only if requested by users or otherwise needed
 

UserPreferences/user_preferences.d.ts

@@ -1,20 +1,4 @@
-export declare class UserPreferences {
-    containsKey(key: string): boolean;
-    getBoolean(key: string, defaultValue?: boolean): boolean;
-    getDouble(key: string, defaultValue?: number): number;
-    getInt(key: string, defaultValue?: number): number;
-    getLong(key: string, defaultValue?: number): number;
-    getString(key: string, defaultValue?: string): string;
-    getStrings(key: string, defaultValue?: string[]): string[];
-    setBoolean(key: string, value: boolean);
-    setDouble(key: string, value: number);
-    setInt(key: string, value: number);
-    setLong(key: string, value: number);
-    setString(key: string, value: string);
-    setStrings(key: string, value: string[]);
-}
-
-/**
+/**
 * report does such key exist
 */
 export declare var hasKey: (key: string) => boolean;
@@ -82,3 +66,8 @@ export declare var setInt: (key: string, value: number) => void;
 * sets value for a key as long integer
 */
 export declare var setLong: (key: string, value: number) => void;
+
+/**
+* removes a value for key
+*/
+export declare var remove: (key: string) => void;

UserPreferences/user_preferences.ios.ts

@@ -54,6 +54,12 @@ export var setNumber = function (key: string, value: number): void {
     userDefaults.synchronize();
 }
 
+export var remove = function (key: string): void {
+    Common.checkKey(key);
+    userDefaults.removeObjectForKey(key);
+    userDefaults.synchronize();
+}
+
 /*
 these are commented out to be used only if requested by users or otherwise needed