add facebook login redirect handler
add a type for handler functions

also rename Json -> JSON in a function as suggested by go tools
update for oauth2 changes

redirect now works, but client creation hangs for some reason
facebook /me works
add facebook API version conf
add facebook API interface
fix handler package tests
update docs
add /me/accounts API call
add getting the page access_token in redirected handler
add users to DB

DB includes the access tokens used to communicate with Facebook
This means that Facebook login should persist through server crashes
which might or might not be relevant
update handler to get the page access token

it should also update persist the tokens in the DB
use actual test user and page IDs for tests
update redirected handler to store access_tokens in DB
add main conf

this conf currently holds the domain and port information
user print(err) instead of println(err)