hd: add spanish wordlist. fixes #138.

lib/hd/mnemonic.js

@@ -59,7 +59,8 @@ Mnemonic.languages = [
   'english',
   'french',
   'italian',
-  'japanese'
+  'japanese',
+  'spanish'
 ];
 
 /**

lib/hd/wordlist-browser.js

@@ -22,6 +22,8 @@ exports.get = function get(name) {
       return words.italian;
     case 'japanese':
       return words.japanese;
+    case 'spanish':
+      return words.spanish;
     default:
       throw new Error('Unknown language: ' + name);
   }

lib/hd/wordlist.js

@@ -20,6 +20,8 @@ exports.get = function get(name) {
       return require('./words/italian.js');
     case 'japanese':
       return require('./words/japanese.js');
+    case 'spanish':
+      return require('./words/spanish.js');
     default:
       throw new Error('Unknown language: ' + name);
   }

lib/hd/words/index.js

@@ -15,3 +15,4 @@ exports.english = require('./english.js');
 exports.french = require('./french.js');
 exports.italian = require('./italian.js');
 exports.japanese = require('./japanese.js');
+exports.spanish = require('./spanish.js');