Inline styles

Convert a few components to use RCSS.
BlockMessageList to inline styles

Convert more of BlockMessageList to inline styles.
Add util functions to StyleSet.
Move injectStyle to StyleSet.
Finish converting BlockMessageList to inline styles
Delete InlineMessageList
Convert MessageView to inline styles
Convert ThreadView to inline, remove rest

Convert ThreadView to inline styles.
Remove util file.
clearfix should always be an object
Refactor StyleSet into StyleMixin and Styles
Add name param to StyleSet, abandon StyleMixin
Merge branch 'inline-css'