Squashed 'focus/' changes from 7e1a3f8..629b305

629b305 Move fading under wp.editor.
efb7aa7 Set a minimum height of 300 for the text editor.
a6badb8 Initial height of 300, not window height. Don't jump height to window height.
3411d7b Disable fading for now. Focusing (heh) on the scrolling behavior first.
e97d8fc Focus: lower z-index under adminbar and menu panels, and only target the main editor's TinyMCE classes.
cfe068a Added modal for content blocks.
0cc1b31 Fix padding issues, again.
04a8c0a Added an inline toolbar for text formatting.
de9b238 Fixed some content styles.

git-subtree-dir: focus
git-subtree-split: 629b3057662534b8302ef49284e58531ce260457
Pull changes from focus plugin.
Enable fading.
Unpin the toolbar at 100px form the bottom.
Hack to resize the toolbars when changing the page layout.