removed a few unused imports

plume-common/src/lib.rs

@@ -2,9 +2,7 @@
 
 #[macro_use]
 extern crate activitystreams_derive;
-use activitystreams_traits;
 
-use serde;
 #[macro_use]
 extern crate shrinkwraprs;
 #[macro_use]

src/api/mod.rs

@@ -2,10 +2,8 @@
 use rocket::{
     request::{Form, Request},
     response::{self, Responder},
-    Outcome,
 };
 use rocket_contrib::json::Json;
-use serde_json;
 
 use plume_common::utils::random_hex;
 use plume_models::{api_tokens::*, apps::App, users::User, Error, PlumeRocket};