remove crypto hash transition code

src/crypto.js

@@ -5,7 +5,6 @@ var crypto = require('crypto')
 var convert = require('./convert')
 
 function hash160(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
 
   var step1 = sha256(buffer)
 
@@ -16,20 +15,14 @@ function hash160(buffer) {
 }
 
 function hash256(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
-
   return sha256(sha256(buffer))
 }
 
 function sha1(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
-
   return crypto.createHash('sha1').update(buffer).digest()
 }
 
 function sha256(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
-
   return crypto.createHash('sha256').update(buffer).digest()
 }
 

src/script.js

@@ -184,7 +184,7 @@ function isSmallIntOp(opcode) {
 }
 
 Script.prototype.getHash = function() {
-  return crypto.hash160(this.buffer)
+  return crypto.hash160(new Buffer(this.buffer))
 }
 
 /**