fluxbb/markdown — pull request #2 by franzliedke (2014-12-06 23:34:24+00:00)
Title: [CM-29] Allow leading spaces in headings.

The CommonMark spec states:

> The opening `#` character may be indented 0-3 spaces.

This is shown in example 29.

It is fixed here, breaks existing tests, however. This is a change of behavior.