pydata/pandas — pull request #6628 by jreback (2014-03-13 13:32:40+00:00)
Title: BUG: Bug in fillna with limit and value specified

from SO: http://stackoverflow.com/questions/22379343/change-first-occurrence-of-nan-in-a-specific-dataframe-row-to-a-new-value/22380225#22380225