Use 401 status code for some OAuth 2 errors
Use a more specific env variable for insecure transports
Use OAUTHLIB_INSECURE_TRANSPORT
docs: add missing method mentions in oauth1.rfc5849.request_validator.RequestValidator docstring
docs: add missing method usage info in oauth1 RequestValidator.get_realms() docstring
docs: add more verbose docstring in oauth1 RequestValidator methods

- add link to Section 2.3 RFC 5849 that explains why there is a need for
  token invalidation and give a clue how it can be invalidated (refs #202)
- add example implementation of validate_realms
- explain why `verify_request_token` does not double functionality of
  `validate_request_token` (refs #185)
Merge pull request #250 from swistakm/fix/oauth1-request-validator-docs-fixes

OAuth1.0 RequestValidator multiple docs fixes
Merge pull request #249 from dasevilla/insecure-uris

Use a more specific env variable for insecure transports
Improve urldecode error message on incorrectly encoded strings. CC #227.
Set default encoding type to UTF-8 for to_unicode.
Pass request object to oauth1.Client.get_oauth_params.

This makes it much easier to do interesting client customisations which
require extra OAuth params to be included in the signature calculation
as well as in the authorization header.
Accept 'Content-Type: application/x-www-form-urlencoded;charset=utf8' also
Fix Oauth1 client tests to pass request param to get_oauth_params method.
Merge pull request #251 from tuannh99/master

Accept 'Content-Type: application/x-www-form-urlencoded;charset=utf8' al...
Merge pull request #247 from asteinlein/master

Use 401 status code for some OAuth 2 errors
Expose is_secure_transport publicly via ouathlib.oauth2.
Add __repr__ for oauth 1 clients.
Rename crypto token to signed token in setup.
0.6.2
Copy variables dict before scrubbing secrets.

This dict is the actual variables dict. Changing its members will directly
change the values of the current object. The __repr__ function overwrites both
secrets with stars.