Paragraphs with bottom margins cause a blank paragraph to be inserted below it

[kylebragger]

When paragraphs in the editable container have an explicit bottom margin set, Quill inserts a blank paragraph below it.

Steps for Reproduction

1. Visit http://codepen.io/anon/pen/mEpzAA
2. Change the margin-bottom in the CSS column to 1rem (or anything else non-zero)
3. Save
4. Refresh

Expected behavior: Paragraphs in #editor2 are rendered with the specified bottom margin.

Actual behavior: Paragraphs in #editor2 are rendered with the specified bottom margin and a new, blank paragraph is inserted below it.

If you change margin-bottom back to 0, the issue goes away.

Platforms: Chrome 51 on Mac OS X 10.11.5, no extensions, incognito window

Version: Beta 8 (also happens in beta 6)