Refactoring part 1

Some changes for workers, but stopped due to refactoring

eveai_app/errors.py

@@ -0,0 +1,22 @@
+from flask import render_template, request, jsonify
+
+
+def not_found_error(error):
+    if request.accept_mimetypes.accept_json and not request.accept_mimetypes.accept_html:
+        response = jsonify({'error': 'Not found'})
+        response.status_code = 404
+        return response
+    return render_template('error/404.html'), 404
+
+
+def internal_server_error(error):
+    if request.accept_mimetypes.accept_json and not request.accept_mimetypes.accept_html:
+        response = jsonify({'error': 'Internal server error'})
+        response.status_code = 500
+        return response
+    return render_template('error/500.html'), 500
+
+
+def register_error_handlers(app):
+    app.register_error_handler(404, not_found_error)
+    app.register_error_handler(500, internal_server_error)