Merge pull request #76 from igaiga/for_rails4

Adopt to Rails4.

_posts/2012-04-18-app.markdown

@@ -110,7 +110,7 @@ The app doesn't look very nice yet. Let's do something about that. We'll use the
 Open `app/views/layouts/application.html.erb` in your text editor and above the line
 
 {% highlight erb %}
-<%= stylesheet_link_tag "application" %>
+<%= stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true %>
 {% endhighlight %}
 
 add
@@ -251,19 +251,7 @@ Now refresh your browser to see what changed.
 
 If you try to open [http://localhost:3000](http://localhost:3000) it still shows the "Welcome aboard" page. Let's make it redirect to the ideas page.
 
-On Mac OS X and Linux, in the terminal run:
-
-{% highlight sh %}
-rm public/index.html
-{% endhighlight %}
-
-On Windows, in the command prompt run:
-
-{% highlight bat %}
-del public\index.html
-{% endhighlight %}
-
-Then open `config/routes.rb` and after the first line add
+Open `config/routes.rb` and after the first line add
 
 {% highlight ruby %}
 root :to => redirect('/ideas')

_posts/2013-05-02-install.markdown

@@ -36,6 +36,12 @@ Click the Apple menu and choose *About this Mac*.
 
 Double click the downloaded file and it will unpack it into the current directory. Double click the the newly unpacked 'RailsInstaller-1.0.3-osx-10.7.app' or 'RailsInstaller-1.0.3-osx-10.6.app' and follow the instructions. It will open a README file with 'Rails Installer OS X' at the top. Please **ignore** the instructions in this file.
 
+If the Rails version wasn't latest, you could update it using a following command on terminal.
+
+{% highlight sh %}
+gem update rails --no-ri --no-rdoc
+{% endhighlight %}
+
 **Final step.** Install a text editor to edit code files. For the workshop we recommend the text editor Sublime Text.
 
 * [Download Sublime Text and install it](http://www.sublimetext.com/2)
@@ -48,6 +54,12 @@ Now you should have a working Ruby on Rails programming setup. Congrats!
 
 Download [RailsInstaller](http://rubyforge.org/frs/download.php/76862/railsinstaller-2.2.1.exe) and run it. Click through the installer using the default options.
 
+If the Rails version wasn't latest, you could update it using a following command on "Command Prompt with Ruby on Rails".
+
+{% highlight sh %}
+gem update rails --no-ri --no-rdoc
+{% endhighlight %}
+
 Installation of Git and SSH-keys is required if you want to [put your app online with Heroku](/heroku).
 
 **Final step.** You also need a text editor to edit code files. For the workshop we recommend the text editor Sublime Text.