Added suppoprt bottle.auth

[avelino]

Today at the core of the bottle exist a basic authentication method, the idea is to make the "bottle-auth" conversation with the "bottle auth."

HTTP authentication data as a (user, password) tuple. This
implementation currently supports basic (not digest) authentication
only. If the authentication happened at a higher level (e.g. in the
front web-server or a middleware), the password field is None, but
the user field is looked up from the ``REMOTE_USER`` environ
variable. On any errors, None is returned.

Example:

import bottle
from bottle import Bottle, redirect, request, run
from bottle.ext import auth
from bottle.ext.auth.decorator import login
from bottle.ext.auth.social.facebook import Facebook, UserDenied
from bottle.ext.auth.social.facebook import NegotiationError
from pprint import pformat

facebook = Facebook('fb-key', 'fb-secret',
                    'http://127.0.0.1:8000/', 'email')

app = Bottle()
plugin = auth.AuthPlugin(facebook)
app.install(plugin)


@app.route('/login')
def login(auth):
    return auth.redirect(request.environ)


@app.route('/')
@bottle.auth(auth) # alternative used core source bottle
def home():
    user = auth.get_user(request.environ)
    return "Home page {}".format(pformat(user))


run(app=app, host='0.0.0.0', port='3333', debug=True)