Allow overriding of JsonApiDatastore's error handler in derived class…

…es (#11)

Change visibility of handleError method from private to protected to allow overriding with custom error handlers in derived classes

src/services/json-api-datastore.service.ts

@@ -2,6 +2,7 @@ import * as _ from 'underscore';
 import { Injectable } from '@angular/core';
 import { Http, Headers, RequestOptions, Response } from '@angular/http';
 import { Observable } from 'rxjs/Observable';
+import { ErrorObservable } from 'rxjs/observable/ErrorObservable';
 import 'rxjs/add/operator/map';
 import 'rxjs/add/operator/catch';
 import 'rxjs/add/observable/throw';
@@ -141,7 +142,7 @@ export class JsonApiDatastore {
         return model;
     }
 
-    private handleError(error: any) {
+    protected handleError(error: any) {
         let errMsg: string = (error.message) ? error.message :
             error.status ? `${error.status} - ${error.statusText}` : 'Server error';
         console.error(errMsg);