Modify CMakeLists for code samples to make it automatically scan for .cpp files in ./samples directory and build executables for each of them.
Change samples' executables directory to the root build directory of the library.
Merge pull request #18 from druzhkov-paul/samples_auto_build

Auto detection and build of samples.
Update README.md

Add a link to documentation
Sepia filter implementation and sample.
Modified documentation.
File with the sample for sepia filter.
Check input image.
Parameters (hue, saturation, value) were removed.
Tests for sepia filter were written.
Replace tabs with whitespaces.
Test was modified.
Test was modified.
Test was removed.
Test was restored, interval [<v>-1,<v>+1] was set for hue, saturation and value.
Matrix initialization in the test for sepia effect.
Merge pull request #23 from valentina-kustikova/sepia_impl

Sepia implementation and sample