Makes signed oauth_signature str rather than bytes

When using header auth in py3k (maybe even 2.7, didn't verify), the
oauth_signature was encoded with repr of the bytestring rather than the
string value.

e.g. "b%27somesignature%27"

closes #130

AUTHORS.md

@@ -3,10 +3,10 @@
 This project was concieved of with the help of the full software team at Litl.
 
 Special thanks to Kenneth Reitz for the amazing [Requests](https://github.com/kennethreitz/requests) library. It made
-this project sane. 
+this project sane.
 
-Also kudos to Miguel Araujo for utilizing the pre-request hook of Requests in his OAuth 1.0/a library 
-[requests-oauth](https://github.com/maraujop/requests-oauth) which is used as a model herein for parts of the 
+Also kudos to Miguel Araujo for utilizing the pre-request hook of Requests in his OAuth 1.0/a library
+[requests-oauth](https://github.com/maraujop/requests-oauth) which is used as a model herein for parts of the
 OAuth 1.0/a hook; thanks Miguel!
 
 
@@ -32,4 +32,5 @@ Add yourself as a contributor!
 * [Marek Rei](https://github.com/marekrei)
 * [Kieron Briggs](https://github.com/kbriggs)
 * [Tatsuji Tsuchiya](https://github.com/ta2xeo)
+* [Chris McGraw](https://github.com/mitgr81)
 * (your name here)

rauth/oauth.py

@@ -149,7 +149,7 @@ def sign(self,
         hashed = hmac.new(key, signature_base_string, sha1)
 
         # return the signature
-        return base64.b64encode(hashed.digest())
+        return base64.b64encode(hashed.digest()).decode()
 
 
 class RsaSha1Signature(SignatureMethod):
@@ -215,7 +215,7 @@ def sign(self,
         hashed = s.sign(h)
 
         # return the signature
-        return base64.b64encode(hashed)
+        return base64.b64encode(hashed).decode()
 
 
 class PlaintextSignature(SignatureMethod):

tests/test_oauth.py

@@ -17,6 +17,11 @@
 except ImportError:
     raise RuntimeError('PyCrypto is required to run the rauth test suite')
 
+try:
+    stringtype = unicode  # python 2
+except NameError:
+    stringtype = str  # python 3
+
 assert RSA
 
 
@@ -36,8 +41,8 @@ def test_hmacsha1_signature(self):
                                                    self.oauth_params,
                                                    self.req_kwargs)
         self.assertIsNotNone(oauth_signature)
-        self.assertIsInstance(oauth_signature, bytes)
-        self.assertEqual(oauth_signature, b'cYzjVXCOk62KoYmJ+iCvcAcgfp8=')
+        self.assertIsInstance(oauth_signature, stringtype)
+        self.assertEqual(oauth_signature, 'cYzjVXCOk62KoYmJ+iCvcAcgfp8=')
 
     def test_normalize_request_parameters_params(self):
         # params as a dict
@@ -98,7 +103,7 @@ def test_sign_utf8_encoded_string(self):
                                        self.url,
                                        self.oauth_params,
                                        req_kwargs)
-        self.assertEqual(b'cYzjVXCOk62KoYmJ+iCvcAcgfp8=',  sig)
+        self.assertEqual('cYzjVXCOk62KoYmJ+iCvcAcgfp8=',  sig)
 
     def test_sign_with_data(self):
         # in the event a string is already UTF-8
@@ -110,7 +115,7 @@ def test_sign_with_data(self):
                                        self.url,
                                        self.oauth_params,
                                        req_kwargs)
-        self.assertEqual(b'JzmJUmqjdNYBJsJWbtQKXnc0W8w=',  sig)
+        self.assertEqual('JzmJUmqjdNYBJsJWbtQKXnc0W8w=',  sig)
 
     def test_remove_query_string(self):
         # can't sign the URL with the query string so
@@ -186,12 +191,12 @@ def test_rsasha1_signature(self):
                                                   self.oauth_params,
                                                   self.req_kwargs)
         self.assertIsNotNone(oauth_signature)
-        self.assertIsInstance(oauth_signature, bytes)
+        self.assertIsInstance(oauth_signature, stringtype)
         self.assertEqual(oauth_signature,
-                         b'MEnbOKBw0lWi5NvGyrABQ6tPygWiNOjGz47y8d+SQfXYrzsvK'
-                         b'kzcMgt2VGBRgKsKSdFho36TuCuP75Qe1uou6/rhHrZoSppQ+6'
-                         b'vdPSKkriGzSK3azqBacg9ZIIVy/atHPTm6BAvo+0v4ysiI9ci'
-                         b'7hJbRkXL0NJVz/p0ZQKO/Jds=')
+                         'MEnbOKBw0lWi5NvGyrABQ6tPygWiNOjGz47y8d+SQfXYrzsvK'
+                         'kzcMgt2VGBRgKsKSdFho36TuCuP75Qe1uou6/rhHrZoSppQ+6'
+                         'vdPSKkriGzSK3azqBacg9ZIIVy/atHPTm6BAvo+0v4ysiI9ci'
+                         '7hJbRkXL0NJVz/p0ZQKO/Jds=')
 
     def test_rsasha1_badargument(self):
         self.assertRaises(ValueError, RsaSha1Signature().sign,