add callouts for bootstrap 2.3.2 docs and 3.0 rc1 post
add ads to v3 docs
Merge branch 'bs3_add_ads' into bs3_rc1
Merge branch 'bs3_old_docs_callout' into bs3_rc1
vertically center ad
relative url
copy change to css page subheading
change download button label
flatten docs dir back into root
finish flattening repo structure; add dist folder of compiled css/js
Merge branch 'bs3_rc1' into 3.0.0-wip