add boost_color.rst
Add doc for boost color function
add example
Correct documentation, rename function
Merge pull request #29 from stragger/boost_color_documentation

"Boost color" filter documentation
add documentation for glow function
fix list
fix error with equation
fix list
add default value for sigma
Images to the sepia documentation were appended.
Merge pull request #44 from valentina-kustikova/sepia_docs_fix

Add images to Sepia documentation
Merge pull request #36 from stragger/glow_documentation

Add documentation for Glow function
Clean repo
change algorithm description in Tint filter docs. rename images.
Merge branch 'master' into FilmGrain-implementation