Implement mosaic filter.
Add documentation.
Merge branch 'feature-mosaic'
Implement drawing text on image.
Add methods drawText() in ImageProcessing class.
Merge branch 'feature-text-draw'
Add unit test for bug.
Create edge resize helper dummy and unit tests.
Add implementation of edge resize helper.
Remove unused code.
Change unit tests to work with rectangular instead of square image.
Add implementation of edge remove helper.
Use edge resize helper to solve bug.
Merge branch 'bugfix-matrix-filter-image-edge'