added logo asset
Merge branch 'VideoPageTool' into VideoPageTool-VID-652-wv-header
added WikiaVideo body class, added logo to sprite, basic header markup
basic styling added
add chevron icon for dropdown menu
order css properties, add i18n messages, adjust markup classes for new grid
add box sizing to column only
resolve merge conflicts
Merge pull request #1568 from Wikia/VideoPageTool-VID-652-wv-header

Video page tool vid 652 wv header