brings back drag and drop image uploading for blog posts
brings back syntax highlighting

 - drops Coderay in favor of existing pygmentize implementation
 - using the "friendly" pygmentize theme: `pygmentize -S friendly -f html`
 - for some reason the first line of code has strange indentation, so hacked around that
 - made sure we show ~66 characters on a line without having to scroll
switches to non-indented html output in development

 - the html formatting was causing the code indentitation issue, and had different results on staging and development. This makes the environments more consistent
Merge branch 'develop'