add function interface in photoeffects.hpp
Add function fadeColor in photoeffects.cpp
Add test
Edit files for Film Glain
correct error in .hpp
correct name of function
add a new version of the files.Film Grain
add a new version of the files.Fade Color
Empty emplementation of the fade color  filter (src/fadeColor.cpp) and fake test (test/fadeColor_test.cpp)
Empty emplementation of the Film Grain filter (src/filmGrain.cpp) and fake test (test/filmGrain_test.cpp)
Merge pull request #13 from VadimLevin/antique_implementation

Trying pull-request. Added prototype of antique effect.
Interface of sepia function was modificated.
Merge master with branch.
Merge pull request #7 from DolotovEvgeniy/FadeColor-implementation

dummy color fading filter implementation
Merge upstream updates into the branch.
Merge pull request #14 from valentina-kustikova/sepia_interface_mofification

new interface for sepia filter
add new interface fadeColor function
merge branch with master
merge branch with master
add new interface for filmGrain function