commit development & production copies of main stylesheet
add "post-header-link" class to <h1> snippet title in index.html
change 'post-header-link' classname to 'post-snippet-link'
change 'post-header-link' classname to 'post-snippet-link'
commit development & production copies of main stylesheet
create a Sass transition mixin (see msg)

create a Sass mixin called 'transitions' that places all the required transition properties with vendor prefixes in a stylesheet, execpt for the property which is passed in as a parameter.
add <header> to the advertsing section in the aside
add post-snippet-link class to all <h1> link tags of category page snippets