New icon and auto adjust in hostname

.gitignore

@@ -0,0 +1,31 @@
+
+# Created by https://www.gitignore.io/api/macos
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# End of https://www.gitignore.io/api/macos

options.js

@@ -1,10 +1,21 @@
 // Saves options to localStorage.
 function saveOptions(event) {
   event.preventDefault();
+
+  function adjustHostname(hostname) {
+    var adjustedHostname = hostname.replace(/\s+/g, '-');
+    if (!adjustedHostname.endsWith(".local")) {
+      adjustedHostname += ".local";
+    }
+    return adjustedHostname;
+  }
 
-  localStorage["hostname"] = document.getElementById("hostname").value;
+  var adjustedHostname = adjustHostname(document.getElementById("hostname").value);
+  localStorage["hostname"] = adjustedHostname;
   localStorage["play-position"] = document.getElementById("play-position-current").checked ? "current" : "0";
 
+  document.getElementById("hostname").value = localStorage["hostname"];
+
   chrome.extension.getBackgroundPage().window.location.reload();
 
   // Show status to let user know options were saved.