First cut at adding SubtractOverscan, CorrectGain, and CombineHalves classes.
initial implementation of detector properties
finished detector readin
detectorproperties linked to ccd_detector on gmosmosrawfitsfile
Merge pull request #6 from wkerzendorf/gmos/detector_properties

Gmos/detector properties
fixed reading in of detector properties
fix again for the detector properties class. but works now
proj.science[0].chip1_detector
<detector id=11 ccdname=EEV 8194-19-04 xbin=2 ybin=2 gain=1.90>
Split of implementation to functions, and call these in the __call__ function.
As a result, the CorrectGain and CombineHalves classes are almost empty shells.
It may now be more logical and easy to define these inside the pipeline.
Merge pull request #4 from mhvk/gmos/basics

First cut at adding SubtractOverscan, CorrectGain, and CombineHalves classes
fixed mistake with instantiation in reading the fits files
restructered subtract_overscan function
added create uncertainty functions
finished GMOSPrepare
finished GMOSPrepare
refactored GMOSDetectorProperties
fixed type
added the GMOSCCDImage
Merge pull request #8 from wkerzendorf/gmos/split_func_to_detector

Splitting functions to take indivdual amplifiers