Let FitsHeader take an unnamed file_name argument in addition to the kwarg version.  (Basically interprets header as file_name if it is a string)
(#508)
Enable reading FitsHeader from .head files with text_file=True kwarg
(#508)
Also add text_file kwarg to FitsWCS function
(#508)
Have kwarg order match that given in doc string
(#508)
Fix to work with python 2.4
Add unit test for reading SCamp .head file
(#508)
Add this feature to CHANGELOG
(#508)
Merge pull request #509 from GalSim-developers/#508

#508 Enable reading FitsHeader from SCamp .head file