Edit files for Film Glain
correct error in .hpp
add a new version of the files.Film Grain
Empty emplementation of the Film Grain filter (src/filmGrain.cpp) and fake test (test/filmGrain_test.cpp)
Prepare directories structure for documentation.
add new interface fadeColor function
merge branch with master
merge branch with master
add new interface for filmGrain function
edit errors
edit test
edit test, add new interface for filmGrain function
Merge pull request #16 from DolotovEvgeniy/FadeColor-implementation

Fade color implementation
merge FilmGrain-implementation branch with master
Merge pull request #6 from DolotovEvgeniy/FilmGrain-implementation

Film grain implementation
Merge branch 'master' into sepia_documentation
Configuration of the documnetation was modified.
Sepia.rst was modified.
Merge pull request #15 from valentina-kustikova/sepia_documentation

Create basic structure of documentation files. Write dummy documentation for sepia filter.
Modify CMakeLists for code samples to make it automatically scan for .cpp files in ./samples directory and build executables for each of them.