Update Octopress config

- Remove _octopress.yml and move settings into _config.yml as per Octopress' documentation
- Close #163

_config.yml

@@ -24,6 +24,20 @@ kramdown:
   use_coderay: false
 
 
+# Octopress
+
+# Default extensions
+post_ext: md
+page_ext: md
+
+# Found in _templates/
+post_layout: post
+page_layout: page
+
+# Format titles with titlecase?
+titlecase: true
+
+
 # Site owner
 owner:
   name: Your Name