Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/oauthlib/oauth1/__init__.py

@@ -0,0 +1,28 @@
+"""
+oauthlib.oauth1
+~~~~~~~~~~~~~~
+
+This module is a wrapper for the most recent implementation of OAuth 1.0 Client
+and Server classes.
+"""
+from .rfc5849 import Client
+from .rfc5849 import (SIGNATURE_HMAC,
+                      SIGNATURE_HMAC_SHA1,
+                      SIGNATURE_HMAC_SHA256,
+                      SIGNATURE_HMAC_SHA512,
+                      SIGNATURE_RSA,
+                      SIGNATURE_RSA_SHA1,
+                      SIGNATURE_RSA_SHA256,
+                      SIGNATURE_RSA_SHA512,
+                      SIGNATURE_PLAINTEXT)
+from .rfc5849 import SIGNATURE_TYPE_AUTH_HEADER, SIGNATURE_TYPE_QUERY
+from .rfc5849 import SIGNATURE_TYPE_BODY
+from .rfc5849.request_validator import RequestValidator
+from .rfc5849.endpoints import RequestTokenEndpoint, AuthorizationEndpoint
+from .rfc5849.endpoints import AccessTokenEndpoint, ResourceEndpoint
+from .rfc5849.endpoints import SignatureOnlyEndpoint, WebApplicationServer
+from .rfc5849.errors import (InsecureTransportError,
+                             InvalidClientError,
+                             InvalidRequestError,
+                             InvalidSignatureMethodError,
+                             OAuth1Error)