Feature/add node description api (#605)

* Starting to build out node descriptions

* Renamed the mod to node_description instead of descriptor

* Returning results loaded from file

* Taking user input for node describe command

* Readline without new dependencies

* Adding input format hint

* Making sure the node can still start even when the descriptor file isn't there yet

* Adding some additional runtime checks

* Removing -dev from minimum node version

* Removing initial :: on serde

* Fixing comment on the /description endpoint

* Swapped json for toml

* Being a bit more specific with my startup message.

* Cleaning up path building

* Nicer runtime checks

* Put path building inside the file methods

mixnode/src/node/http/description.rs

@@ -0,0 +1,9 @@
+use crate::node::node_description::NodeDescription;
+use rocket::State;
+use rocket_contrib::json::Json;
+
+/// Returns a description of the node and why someone might want to delegate stake to it.
+#[get("/description")]
+pub(crate) fn description(description: State<NodeDescription>) -> Json<NodeDescription> {
+    Json(description.inner().clone())
+}

mixnode/src/node/http/mod.rs

@@ -1,7 +1,8 @@
-use rocket::Request;
-
+pub(crate) mod description;
 pub(crate) mod verloc;
 
+use rocket::Request;
+
 #[catch(404)]
 pub(crate) fn not_found(req: &Request) -> String {
     format!("I couldn't find '{}'. Try something else?", req.uri())