Color Matcher Versions Save

This release contains the following changes:

• fixes to handle gray-scale and alpha-channel images
• refactored code for mkl_solver() method for better readability (comply with PEP8)
• added API function ColorMatcher.transfer(src=src, ref=ref, method='hm-mkl-hm')
• note that the existing ColorMatcher(src=src, ref=ref, method='hm-mkl-hm').main() is still viable

Release v0.4.0 contains the following changes:

• new interface method 'mvgd' for analytical solution of a Multi-Variate Gaussian Distribution (MVGD) transfer
• move of the CI pipeline to GitHub Actions

This minor release update covers the following changes:

• output directory creation for processing a stack of input images
• CLI feedback about location of result(s)
• minor update on the documentation
• expand CLI unit tests (e.g. image dimensions)

Release v0.3.2 contains the following changes:

• resolves image file batch processing from the command line following issue #1
• reduces repo size by removing redundant image
• set default paths for command line usage

The release v0.3.1 includes some minor updates and bug fixes including:

• added support for Jupyter Demo using Binder
• resolve uppercase letters provided in method string
• renaming of ./test to ./tests folder
• fix for TestPyPi upload in TravisCI
• removed .DS_Stores files

Release v0.3.0 features an analytical solution to the color transfer based on Multi-Variate-Gaussian Distribution (MVGD).

This release fixes an issue when passing a directory as source in CLI usage (e.g. -s './' or --src='./')

• add code coverage

• fix in CLI usage: strip quotes and whitespaces

• improved Reinhard method