Remove `layout: post` frontmatter from blog posts

It's set globally in `config.rb`, so these were redundant.

Rakefile

@@ -38,7 +38,6 @@ task :new_post, :title do |t, args|
   puts "Creating new post: #{filename}"
   open(filename, 'w') do |post|
     post.puts "---"
-    post.puts "layout: post"
     post.puts "title: \"#{title.gsub(/&/,'&')}\""
     post.puts "date: #{Time.now.strftime('%Y-%m-%d')}"
     post.puts "author: "

doc/patch_release_blog_template.html.md

 ---
-layout: post
 title: "GitLab X.Y.Z Released"
 date: YYYY-MM-DD
 comments: true

doc/release_blog_template.html.md

 ---
-layout: post
 title: "GitLab X.X released with MAIN_CE_FEATURE and MAIN_EE_FEATURE"
 date: YYYY-MM-22
 categories:

source/posts/2011-10-24-gitlab-v1-1-vmware-image.html.md

 --- 
-layout: post
 title: gitlab v1.1 vmware image
 wordpress_id: 8
 wordpress_url: http://blog.gitlabhq.com/?p=7

source/posts/2011-11-07-new-design-is-coming.html.md

 --- 
-layout: post
 title: New design is coming
 wordpress_id: 25
 wordpress_url: http://blog.gitlabhq.com/?p=25

source/posts/2011-11-08-install-guide-from-ryan-wersal.html.md

 --- 
-layout: post
 title: Install guide from Ryan Wersal
 wordpress_id: 36
 wordpress_url: http://blog.gitlabhq.com/?p=36

source/posts/2011-11-16-new-feature-network-graph.html.md

 --- 
-layout: post
 title: "New feature: network graph"
 wordpress_id: 39
 wordpress_url: http://blog.gitlabhq.com/?p=39

source/posts/2011-11-16-new-feature-project-activities.html.md

 --- 
-layout: post
 title: "New feature: Project Activities"
 wordpress_id: 48
 wordpress_url: http://blog.gitlabhq.com/?p=48

source/posts/2011-11-17-features-for-pronto-v1-2-0.html.md

 --- 
-layout: post
 title: Features for Pronto  (v1.2.0)
 wordpress_id: 52
 wordpress_url: http://blog.gitlabhq.com/?p=52

source/posts/2011-11-22-pronto-released.html.md

 --- 
-layout: post
 title: Pronto released
 wordpress_id: 69
 wordpress_url: http://blog.gitlabhq.com/?p=69

source/posts/2011-11-22-whats-next.html.md

 --- 
-layout: post
 title: What's next?
 wordpress_id: 84
 wordpress_url: http://blog.gitlabhq.com/?p=84

source/posts/2011-11-24-issue-prototype.html.md

 --- 
-layout: post
 title: "Issue prototype: "
 wordpress_id: 96
 wordpress_url: http://blog.gitlabhq.com/?p=96

source/posts/2011-11-27-dark-colors-for-code-review.html.md

 --- 
-layout: post
 title: Dark colors for code review
 wordpress_id: 100
 wordpress_url: http://blog.gitlabhq.com/?p=100

source/posts/2011-11-27-issues-become-simplier.html.md

 --- 
-layout: post
 title: Issues become simplier
 wordpress_id: 103
 wordpress_url: http://blog.gitlabhq.com/?p=103

source/posts/2011-11-28-merge-requests-v1.html.md

 --- 
-layout: post
 title: Merge Requests v1
 wordpress_id: 108
 wordpress_url: http://blog.gitlabhq.com/?p=108

source/posts/2011-12-01-new-commit-show-page.html.md

 --- 
-layout: post
 title: New commit show page
 wordpress_id: 114
 wordpress_url: http://blog.gitlabhq.com/?p=114

source/posts/2011-12-07-new-access-privilegies.html.md

 --- 
-layout: post
 title: New access privilegies
 wordpress_id: 119
 wordpress_url: http://blog.gitlabhq.com/?p=119

source/posts/2011-12-09-useful-dashboard-first-try.html.md

 --- 
-layout: post
 title: Useful Dashboard - first try
 wordpress_id: 128
 wordpress_url: http://blog.gitlabhq.com/?p=128

source/posts/2011-12-22-gitlabhq-v2-0-moderno.html.md

 --- 
-layout: post
 title: "Gitlabhq v2.0: Moderno"
 wordpress_id: 153
 wordpress_url: http://blog.gitlabhq.com/?p=153

source/posts/2012-01-05-2-1-pre.html.md

 --- 
-layout: post
 title: 2.1.pre
 wordpress_id: 183
 wordpress_url: http://blog.gitlabhq.com/?p=183