Change theme to remote and update plugins

Updated theme configuration and added remote theme support.

Author: asanka-code

_config.yml

@@ -31,9 +31,10 @@ twitter_username: jekyllrb
 github_username:  jekyll
 
 # Build settings
-theme: cayman 
-# remote_theme: jekyll-serif-theme 
+# theme: cayman 
+remote_theme: pages-themes/cayman@v0.2.0
 plugins:
+  - jekyll-remote-theme # add this line to the plugins list if you already have one
   - jekyll-feed
 
 # Exclude from processing.