#2073: fix spelling

big-integer/big-integer-tests.ts

@@ -1,4 +1,4 @@
-/// <reference path="bigInteger.d.ts" />
+/// <reference path="big-integer.d.ts" />
 
 // constructor tests
 var noArgument = bigInt(),

big-integer/big-integer.d.ts

@@ -197,6 +197,6 @@ interface BigIntegerStatic {
 
 declare var bigInt: BigIntegerStatic;
 
-declare module "BigInteger" {
+declare module "big-integer" {
     export = bigInt;
 }