Big repository reorganization

The code is divided in three crates:
- plume-common, for the ActivityPub module, and some common utils
- plume-models, for the models and database-related code
- plume, the app itself

This new organization will allow to test it more easily, but also to create other tools that only reuse a little part of
the code (for instance a Wordpress import tool, that would just use the plume-models crate)

src/routes/posts.rs

@@ -5,19 +5,19 @@ use rocket::response::{Redirect, Flash};
 use rocket_contrib::Template;
 use serde_json;
 
-use activity_pub::{broadcast, ActivityStream};
-use db_conn::DbConn;
-use models::{
+use plume_common::activity_pub::{broadcast, ActivityStream};
+use plume_common::utils;
+use plume_models::{
     blogs::*,
+    db_conn::DbConn,
     comments::Comment,
     mentions::Mention,
     post_authors::*,
     posts::*,
+    safe_string::SafeString,
     users::User
 };
 use routes::comments::CommentQuery;
-use safe_string::SafeString;
-use utils;
 
 // See: https://github.com/SergioBenitez/Rocket/pull/454
 #[get("/~/<blog>/<slug>", rank = 4)]