Covert px values in markdown-editor.scss to use em. Note: I did this for all values except min-height on .markdown-preview which for some strange reason caused a weird flicker in Firefox.

Add 'markdown-' namespace to .preview and .preview-toggle classes.

Unnested CSS in markdown-editor.scss. Everything is well namespaced now so this is no longer necessary.

Apply consistent sentence case to the title attributes of the markdown tools.

Went with Aron's suggestion of suffixing raw nodes with 'El,' and got rid of the
variable 'ourIframeSelection' as it has nothing to do with iframes and the code
could be written without the need for that variable.

input -> inputEl
textarea -> input

Code cleanup.

First pass at implementing @aron's mockups.

Fix bugs, breakout markdown into its own directive

Forgot to add markdown.coffee

Search for usernames

Remove d3 dependency

Replace the background with a grey bar using a div.

Previously it would update on every scroll or resize event fired on
either the document or body.

This improves performance while scrolling as we're no longer destroying
and recreating every tab on each call to update.

This makes the style and attribute iterators work correctly

Cleanup font icons and add Markdown glyphs

We now only have one of each icon type where possible.

As now we only use it with a false parameter every time,
it is no longer serving any purpose

This way we can search both for the username and the full user format.

Fix #1456

Sync the bridge after beforeAnnotationCreated

Spotted by @gergely-ujvari

This ensures that plugins on both sides have fired and any resulting
modifications are synchronized (document plugin, for instance).

Fix #1502

Remove parent and url values in streamer and notifications

Conflicts:
	h/static/styles/app.scss

Change save shortcut to meta/ctrl + enter.

Classes had been added to the stylesheet but not to the template, and
those that were had typos.