Make expm download link permanent

USING.md

@@ -27,7 +27,7 @@ There are two ways to get expm's command line utility:
 Go [http://expm.co/](http://expm.co/) and grab it using the download link at the bottom. If you want to do this automatically, use this shell command:
 
 ```
-curl -o expm http://expm.co/`curl http://expm.co/__version__`/expm
+curl -o expm http://expm.co/__download__/expm
 ```
 
 After downloading the binary, make it executable:

lib/server.ex

@@ -11,7 +11,7 @@ defmodule Expm.Server do
    dispatch = [
       {:_, [{[], Expm.Server.Http, [repository: repository, endpoint: :list]},     
             {["favicon.ico"], :cowboy_static, [file: "favicon.ico", directory: static_dir]},     
-            {["#{Expm.version}","expm"], :cowboy_static, [file: "expm", directory: static_dir]},                 
+            {["__download__","expm"], :cowboy_static, [file: "expm", directory: static_dir]},                 
             {["s",:'...'], :cowboy_static, [directory: static_dir, mimetypes: {function(:mimetypes,:path_to_mimes,2), :default}]},     
             {["__version__"], Expm.Server.Http.Version, []},      
             {[:package], Expm.Server.Http, [repository: repository, endpoint: :package]},      

lib/server/templates/page.html.eex

@@ -20,7 +20,7 @@
                     <input type="text" name="q" class="search-query" placeholder="Search">  
                   </form>                        
                 </li>
-                <li><a href="/<%= Expm.version %>/expm"><i class="icon-download icon-white"></i><strong>Download</strong></a></li>
+                <li><a href="/__download__/expm"><i class="icon-download icon-white"></i><strong>Download</strong></a></li>
                 <li><a href="https://github.com/yrashk/expm/blob/master/USING.md">Using</a></li>
                 <li><a href="https://github.com/yrashk/expm/blob/master/PUBLISHING.md">Publishing</a></li>
                 <li><a href="https://github.com/yrashk/expm/blob/master/HOSTING.md">Hosting</a></li>
@@ -47,7 +47,7 @@
           <center>This repository is available over HTTP: <code>http://<%= @host %><%= @port %></code></center>
         </div>
         <div class="row">
-          <center><small>Running expm <%= Expm.version %> (<a href="/<%= Expm.version %>/expm">download</a>) on Elixir 
+          <center><small>Running expm <%= Expm.version %> (<a href="/__download__/expm">download</a>) on Elixir 
           <%= System.version %> (<%= {_, sha, _} = System.build_info ; sha %>)
           </small></center>
         </div>