Feature/sherable buttons

added sherable buttons and seo 
these cannot be aligned ? you could also use a heredoc like this:

```
foo = <<MY_STUFF
*= require simple_blog_admin
*= require simple_blog_admin\n
*= require social-share-button\n
MY_STUFF
```
http://rubyquicktips.com/post/4438542511/heredoc-and-indent