Allow bundling for browser

See #12. We've refactored the module a bit more so it can now be bundled with webpack, at least that's what we hope, lol.

lib/dbpf.js

@@ -9,6 +9,7 @@ const Stream = require('./stream');
 const crc32 = require('./crc');
 const { cClass, FileType } = require('./enums');
 const { hex, tgi } = require('./util');
+const inspect = require('./inspect.js');
 
 // # DBPF()
 // A class that represents a DBPF file. A DBPF file is basically just a custom 
@@ -823,7 +824,7 @@ class Entry {
 	// ## [util.inspect.custom](depth, opts)
 	// If we console.log an entry in node we want to convert the TGI to their 
 	// hex equivalents so that it's easier to debug.
-	[util.inspect.custom](depth, opts) {
+	[inspect](depth, opts) {
 		return 'DBPF Entry '+util.inspect({
 			type: hex(this.type),
 			group: hex(this.group),

lib/inspect.js

@@ -1,6 +1,4 @@
 // # inspect.js
-// Exports the custom inspect symbol so that we can customize loggin in 
-// Node.js. We centralize this here so that we can mock this out in the 
-// browser bundle.
-const util = require('util');
-module.exports = util.inspect.custom;
+// Exports the custom inspect symbol so that we can customize logging in 
+// Node.js.
+module.exports = Symbol.for('nodejs.util.inspect.custom');