Support for big title images and bugfixes

Add support for big title images
(e6cb0a4f54).
Several bugfixes including pygment_highlights.css dependency, Index page
alignment/containers, and Index page site title. Also renamed
description to subtitle, in line with the original theme.

exampleSite/content/post/2015-01-19-soccer.md

@@ -1,6 +1,6 @@
 ---
 title: Soccer
-description: Best sport ever!
+subtitle: Best sport ever!
 date: 2015-01-19
 ---
 

exampleSite/content/post/2015-02-13-hamlet-monologue.md

@@ -1,6 +1,6 @@
 ---
 title: To be
-description: ... or not to be?
+subtitle: ... or not to be?
 date: 2015-02-13
 ---
 

exampleSite/content/post/2015-02-20-test-markdown.md

@@ -1,6 +1,6 @@
 ---
 title: Test markdown
-description: Each post also has a subtitle
+subtitle: Each post also has a subtitle
 date: 2015-02-20
 ---
 

exampleSite/content/post/2015-02-26-flake-it-till-you-make-it.md

@@ -1,7 +1,8 @@
 ---
 title: Flake it till you make it
-description: Excerpt from Soulshaping by Jeff Brown
+subtitle: Excerpt from Soulshaping by Jeff Brown
 date: 2015-02-26
+bigimg: /img/path.jpg
 ---
 
 Under what circumstances should we step off a path? When is it essential that we finish what we start? If I bought a bag of peanuts and had an allergic reaction, no one would fault me if I threw it out. If I ended a relationship with a woman who hit me, no one would say that I had a commitment problem. But if I walk away from a seemingly secure route because my soul has other ideas, I am a flake?  

exampleSite/content/post/2016-03-08-code-sample.md

@@ -1,6 +1,6 @@
 ---
 title: Code Sample
-description: Using Pygments
+subtitle: Using Pygments
 date: 2016-03-08
 ---