adds erase

WiFiManager.cpp

@@ -1518,9 +1518,10 @@ void WiFiManager::reportStatus(String &page){
  */
 bool WiFiManager::disconnect(){
   if(WiFi.status() != WL_CONNECTED){
-    DEBUG_WM("Disconnect: Not connected");
+    DEBUG_WM("Disconnecting: Not connected");
     return false;
   }  
+  DEBUG_WM("Disconnecting");
   return WiFi_Disconnect();
 }
 
@@ -1529,9 +1530,19 @@ bool WiFiManager::disconnect(){
  * @access public
  */
 void WiFiManager::reboot(){
+  DEBUG_WM("Restarting");
   ESP.restart();
 }
 
+/**
+ * reboot the device
+ * @access public
+ */
+bool WiFiManager::erase(){
+  DEBUG_WM("Erasing");
+  return WiFi_eraseConfig();
+}
+
 
 /**
  * [resetSettings description]

WiFiManager.h

@@ -147,6 +147,8 @@ class WiFiManager
     void          reboot();
     // disconnect wifi, without persistent saving or erasing
     bool          disconnect();
+    // erase esp
+    bool          erase();
 
     //sets timeout before AP,webserver loop ends and exits even if there has been no setup.
     //useful for devices that failed to connect at some point and got stuck in a webserver loop