First pass at breadcrumbs

Going to move this into the doc title
Fix $/jq jQuery reference error
Fix $/jQuery reference error introduced in 0a15b0af
First pass at switching away from HTTP_REFERER for upload_files cap map in IE9

See #354
Whitelist 'edit_post' and 'upload_files' caps for attachment upload

Both appear to be required in the WP post workflow. See async-upload.php.

See #354
Attachment strings should be localized along with attachment script

There are apparently some cases where the attachment scripts can be loaded
without the main bp-docs-js, so it's best to load the string separately too.

Fixes #417
Readme
Stable tag bumps
POT update for 1.8.0
Merge branch '1.8.x' into folders