Demonstration of using the proposed astropy custom config stuff

dkist/config/__init__.py

@@ -0,0 +1,9 @@
+import astropy.config as astropyconfig
+
+
+class ConfigNamespace(astropyconfig.ConfigNamespace):
+    rootname = 'dkist'
+
+
+class ConfigItem(astropyconfig.ConfigItem):
+    rootname = 'dkist'

dkist/dkist.cfg

@@ -0,0 +1,3 @@
+[io]
+## Name of Preferred fits module
+# preferred_fits_library = 'astropy'

dkist/io/__init__.py

@@ -1,3 +1,21 @@
 from .fits import AstropyFITSLoader, BaseFITSLoader
 from .reference_collections import (BaseFITSArrayContainer, DaskFITSArrayContainer,
                                     NumpyFITSArrayContainer)
+
+__all__ = ['BaseFITSLoader', 'AstropyFITSLoader', 'BaseFITSArrayContainer',
+           'NumpyFITSArrayContainer', 'DaskFITSArrayContainer', 'conf']
+
+
+import dkist.config as _config
+
+
+class Conf(_config.ConfigNamespace):
+    """
+    Configuration Parameters for the IO Package.
+    """
+
+    preferred_fits_library = _config.ConfigItem('astropy',
+                                                "Name of the preferred FITS module.")
+
+
+conf = Conf()