vmg/redcarpet — pull request #338 by Juanxo (2014-01-02 04:26:53+00:00)
Title: Fix vmg/redcarpet#337 by checking also for tabs

As [this](https://github.com/vmg/redcarpet/blob/master/ext/redcarpet/markdown.c#L2605) comment states, the colon after the reference id can be followed either by spaces or tabs but the code currently looks only for spaces.