Add options to configure HTML document title (#154)

* Add option to use site title as HTML document title

* Add configurable title separator character

* Keep old document title behaviour when not using use-site-title

README.md

@@ -134,6 +134,7 @@ Parameter   | Description
 ----------- | -----------
 title       | Page or blog post title
 subtitle    | Short description of page or blog post that goes under the title
+use-site-title | If you want to use the site title rather than page title as HTML document title (ie. browser tab title), use `use-site-title: true`. When set, the document title will take the format `Site Title - Site Description` (eg. `My website - A virtual proof that name is awesome!`). By default, it will use `Page Title` if it exists, or `Site Title` otherwise.
 bigimg      | Include a large full-width image at the top of the page.  You can either give the path to a single image, or provide a list of images to cycle through (see [my personal website](http://deanattali.com/) as an example).
 comments    | If you want do add Disqus comments to a specific page, use `comments: true`. Comments are automatically enabled on blog posts; to turn comments off for a specific post, use `comments: false`. Comments only work if you set your Disqus id in the `_config.yml` file.
 show-avatar | If you have an avatar configured in the `_config.yml` but you want to turn it off on a specific page, use `show-avatar: false`. If you want to turn it off by default, locate the line `show-avatar: true` in the file `_config.yml` and change the `true` to `false`; then you can selectively turn it on in specific pages using `show-avatar: true`.

_config.yml

@@ -102,6 +102,10 @@ url-pretty: "MyWebsite.com"  # eg. "deanattali.com/beautiful-jekyll"
 # Truncates the excerpt to the specified number of words on the index page
 excerpt_length: 50
 
+# Character used to separate site title and description in HTML document title
+# and RSS feed title
+title-separator: "-"
+
 # --- Don't need to touch anything below here (but you can if you want) --- #
 
 # Output options (more information on Jekyll's site)

_includes/head.html

@@ -3,15 +3,15 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
 
-  <title>{% if page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
+  <title>{% if page.use-site-title %}{{ site.title }} {{ site.title-separator }} {{ site.description }}{% elsif page.title %}{{ page.title }}{% else %}{{ site.title }}{% endif %}</title>
 
   <meta name="author" content="{{ site.author.name }}" />
 
   {% if page.subtitle %}
   <meta name="description" content="{{ page.subtitle }}">
   {% endif %}
 
-  <link rel="alternate" type="application/rss+xml" title="{{ site.title }} - {{ site.description }}" href="{{ site.baseurl }}/feed.xml" />
+  <link rel="alternate" type="application/rss+xml" title="{{ site.title }} {{ site.title-separator }} {{ site.description }}" href="{{ site.baseurl }}/feed.xml" />
 
   {% if layout.common-ext-css %}
     {% for css in layout.common-ext-css %}

index.html

@@ -2,6 +2,7 @@
 layout: page
 title: My website
 subtitle: This is where I will tell my friends way too much about me
+use-site-title: true
 ---
 
 <div class="posts-list">