Creates a new Mono project so it can at least build (not yet run) on Xamarin/Mono
Removes MVC test project from Mono solution because of heavy dependencies
Separating Unit Tests

Hopefully rebuilding the projects will fix the AppVeyor issues.
Moving Images in unit test
Adds new test of factory for loading an image from a memory stream
Loads all the test images + tests a few filters as well (failing for gif images)
Adds test for constraints resize
Checks that the image is actually resized
First fix of an animated gif problem on Mono
Fixes a unit test (wrong parameters order)
Re-fix of a Mono problem + modify some 'var' usage
Adds a few more unit tests
Adds a few more unit tests
Adds a few more unit tests
Yet a few other unit tests
Adds tests for saving the files
Removes unnecessary images
Filters the source images a bit, in order to speed up the unit tests + descriptive name
Fixing tests to work on Windows.