use 2048 bits by default

lib/rsa-forge.js

@@ -54,7 +54,7 @@ var forgec = module.exports = {
   // Generate New Keypair
   //
 , generateKeypair: function (bitlen, exp, options, cb) {
-    var fkeypair = forge.pki.rsa.generateKeyPair({ bits: bitlen || 1024, e: exp || 0x10001 });
+    var fkeypair = forge.pki.rsa.generateKeyPair({ bits: bitlen || 2048, e: exp || 0x10001 });
     var result = {
       _forge: fkeypair.privateKey
     , _forgePublic: fkeypair.publicKey