add proxy configuration value

+ document possible configuration options

fixes #109

src/main.rs

@@ -31,6 +31,7 @@ extern crate chrono;
 extern crate fern;
 
 extern crate rand;
+extern crate url;
 
 use std::fs;
 use std::path::PathBuf;
@@ -161,7 +162,7 @@ fn main() {
 
     let mut credentials = get_credentials(false);
 
-    while !spotify::Spotify::test_credentials(credentials.clone()) {
+    while !spotify::Spotify::test_credentials(cfg.clone(), credentials.clone()) {
         credentials = get_credentials(true);
     }
 
@@ -172,7 +173,11 @@ fn main() {
 
     let event_manager = EventManager::new(cursive.cb_sink().clone());
 
-    let spotify = Arc::new(spotify::Spotify::new(event_manager.clone(), credentials));
+    let spotify = Arc::new(spotify::Spotify::new(
+        cfg.clone(),
+        event_manager.clone(),
+        credentials,
+    ));
 
     let queue = Arc::new(queue::Queue::new(spotify.clone()));