Better error reporting for deploy on device

FIxes NativeScript/nativescript-cli#956

mobile/ios/ios-core.ts

@@ -16,6 +16,7 @@ import * as bplistParser from "bplist-parser";
 import * as string_decoder from "string_decoder";
 import * as stream from "stream";
 import * as assert from "assert";
+import {EOL} from "os";
 
 export class CoreTypes {
 	public static pointerSize = ref.types.size_t.size;
@@ -867,6 +868,23 @@ class PosixSocket implements Mobile.IiOSDeviceSocket {
 												}
 												this.$logger.out(output);
 
+												let errorMessage: string = "";
+												if (message.Error) {
+													errorMessage += `Error: ${message.Error} ${EOL}`;
+												}
+												if (message.ErrorDescription) {
+													errorMessage += `ErrorDescription: ${message.ErrorDescription} ${EOL}`;
+												}
+												if (message.ErrorDetail) {
+													errorMessage += `ErrorDetail: ${message.ErrorDetail} ${EOL}`;
+												}
+
+												if (errorMessage) {
+													if (!result.isResolved()) {
+														result.throw(new Error(errorMessage));
+													}
+												}
+
 												if (message.Status && message.Status === "Complete") {
 													if (!result.isResolved()) {
 														result.return(message);