convenience: StealthAddress(str) or StealthAddress(buf)

lib/expmt/stealthaddress.js

@@ -2,12 +2,21 @@ var Stealthkey = require('./stealthkey');
 var Base58check = require('../base58check');
 var Pubkey = require('../pubkey');
 
-var StealthAddress = function StealthAddress(obj) {
+var StealthAddress = function StealthAddress(addrstr) {
   if (!(this instanceof StealthAddress))
-    return new StealthAddress(obj);
-
-  if (obj)
+    return new StealthAddress(addrstr);
+  
+  if (typeof addrstr === 'string') {
+    this.fromString(addrstr)
+  }
+  else if (Buffer.isBuffer(addrstr)) {
+    var buf = addrstr;
+    this.fromBuffer(buf);
+  }
+  else if (addrstr) {
+    var obj = addrstr;
     this.set(obj);
+  }
 };
 
 StealthAddress.prototype.set = function(obj) {

test/stealthaddress.js

@@ -32,6 +32,10 @@ describe('StealthAddress', function() {
     should.exist(sa);
     sa = StealthAddress();
     should.exist(sa);
+    sa = StealthAddress(addressString);
+    should.exist(sa);
+    sa = StealthAddress(Base58check.decode(addressString));
+    should.exist(sa);
   });
 
   describe('#fromBuffer', function() {