Fix documentation needing escapes for tags

_plugins/attach_raw_tag.rb

+module Jekyll
+    class RawTag < Liquid::Block
+      def parse(tokens)
+        @nodelist ||= []
+        @nodelist.clear
+        
+        while token = tokens.shift
+          if token =~ FullToken
+            if block_delimiter == $1
+              end_tag
+              return
+            end
+          end
+          @nodelist << token if not token.empty?
+        end
+      end
+    end
+  end
+  
+  Liquid::Template.register_tag('raw', Jekyll::RawTag)
\ No newline at end of file

course/adding_a_quiz.md

@@ -39,7 +39,7 @@ We just created our first multiple choice quiz!
 To add it to our site, we'll get the `markdown` we got from the **Live Editor** and surround it with the `{% quiz %} {% endquiz %}` tags:
 
 ```markdown
-{{ "{{ quiz " }}}}
+{% raw %}{% quiz %}{% endraw %}
 ---
 primary_color: steelblue
 secondary_color: '#e8e8e8'
@@ -59,7 +59,7 @@ Which of these are `git` commands?
 - [ ] git delete
 - [x] git commit
 - [ ] git pop
-{{ "{{ endquiz " }}}}
+{% raw %}{% endquiz %}{% endraw %}
 ```
 
 This quiz will end up looking something like this:
@@ -91,7 +91,7 @@ Which of these are `git` commands?
 You can add multiple questions to your quiz: just add the `markdown` underneath your previous quiz!
 
 ```markdown
-{{ "{{ quiz " }}}}
+{% raw %}{% quiz %}{% endraw %}
 ---
 primary_color: steelblue
 secondary_color: '#e8e8e8'
@@ -124,7 +124,7 @@ How can you modify your latest commit message?
 1. [ ] git modify_commit_message
 1. [ ] git restore
 
-{{ "{{ endquiz " }}}}
+{% raw %}{% endquiz %}{% endraw %}
 ```
 
 Click on **Next** to move to the second question!

course/adding_content.md

@@ -46,7 +46,7 @@ If you want to attach a file, you'll have to store it first.
 You can use of the one *directories* in the `attached_files/` directory.
 Let's add a `.pdf` file to our course: we'll have to store it in the `attached_files/pdf` directory.
 
-`{% attach_file {"file_name": "pdf/pro_git.pdf", "title":"Click here to download the Pro Git book"} %}`
+`{% raw %}{% attach_file {"file_name": "pdf/pro_git.pdf", "title":"Click here to download the Pro Git book"} %}{% endraw %}`
 
 Here's our page after adding all the content we previously mentioned:
 

course/adding_slides.md

@@ -51,7 +51,7 @@ Distributed means that all users have a copy of the repository instead of a cent
 
 Now we can attach our slides like we learned:
 
-`{% attach_file {"file_name": "slides_markdown/git_slides.pdf", "title":"Git slide deck"} %}`
+`{% raw %}{% attach_file {"file_name": "slides_markdown/git_slides.pdf", "title":"Git slide deck"} %}{% endraw %}`
 
 ## Customizing your slides