Remove now-deprecated preserve-inputs package from examples

Also, add a helpful log message to help users know to remove the package.

examples/leaderboard/.meteor/packages

@@ -6,4 +6,3 @@
 standard-app-packages
 autopublish
 insecure
-preserve-inputs

examples/parties/.meteor/packages

@@ -4,7 +4,6 @@
 # but you can also edit it by hand.
 
 standard-app-packages
-preserve-inputs
 accounts-ui
 accounts-password
 d3

examples/todos/.meteor/packages

@@ -8,5 +8,4 @@ underscore
 backbone
 spiderable
 jquery
-preserve-inputs
 insecure

examples/wordplay/.meteor/packages

@@ -6,4 +6,3 @@
 standard-app-packages
 insecure
 jquery
-preserve-inputs

packages/preserve-inputs/package.js

@@ -3,6 +3,4 @@ Package.describe({
   internal: true
 });
 
-Package.on_use(function (api) {
-  // Deprecated -- Meteor UI makes preserve directives unnecessary
-});
+console.log("The 'preserve-inputs' package is now unnecessary and deprecated.");