Fix selection of ANONYMOUS mech.
Fix ANONYMOUS mech constructor.
Merge http://github.com/dwd/Suelta
Add basic support for X-MESSENGER-OAUTH2.
Add X-MESSENGER-OAUTH2 to the docs.
Merge branch 'master' of git://github.com/dwd/Suelta
Add X-FACEBOOK-PLATFORM mechanism.

Required values:
    api_key      - actually seems to be optional from experimentation
    access_token - get using OAuth via external means
Work around Python3's byte semantics.
Merge pull request #1 from legastero/master

Add basic X-MESSENGER-OAUTH2 support