fix the loading for Key.js

Now, like all other modules loaded in the bitcore object, Key is only required
when it is actually used. All tests pass in node and the browser.

bitcore.js

@@ -30,7 +30,8 @@ requireWhenAccessed('Peer', './Peer');
 requireWhenAccessed('Block', './Block');
 requireWhenAccessed('ScriptInterpreter', './ScriptInterpreter');
 requireWhenAccessed('Bloom', './Bloom');
-module.exports.KeyModule = require('./Key');
+//module.exports.KeyModule = require('./Key');
+requireWhenAccessed('KeyModule', './Key');
 requireWhenAccessed('SINKey', './SINKey');
 requireWhenAccessed('SIN', './SIN');
 requireWhenAccessed('PrivateKey', './PrivateKey');

browser/browserify.js

@@ -35,6 +35,7 @@ var modules = [
   'PeerManager',
   'PrivateKey',
   'RpcClient',
+  'Key',
   'SIN',
   'SINKey',
   'Script',
@@ -60,7 +61,6 @@ b.require('browserify-buffertools/buffertools.js', {expose:'buffertools'});
 b.require('./bitcore', {expose: 'bitcore'});
 b.require('buffer', {expose: 'buffer'});
 b.require('base58-native');
-b.require('./Key.js', {expose: 'KeyModule'});
 b.require('./util/log');
 b.require('./util/util');
 b.require('./util/EncodedData');