Fixes from code review

Author: pontusmelke

src/v1/integer.js

@@ -21,6 +21,8 @@
 // https://github.com/dcodeIO/Long.js
 // License Apache 2
 
+import {newError} from "./error";
+
 /**
  * Constructs a 64 bit two's-complement integer, given its low and high 32 bit values as *signed* integers.
  *  See the from* functions below for more convenient ways of constructing Integers.