Added the isometric_engine namespace and made sdl-wrapper a git submodule.
Avoided calling Wrapper::set_screen on every tick.
Fixed sdl-wrapper to sdl_wrapper.
Made it so that sdl-wrapper's demo doesn't get compiled.
Hopefully fixed Demo.* location on CMakeLists.txt
Now I actually fixed the location of the Demo files.
Yet another attempt to fix the location of Demo.?pp.
Specified compilation on README.md.
Fixed markdown code tags.
Merge pull request #2 from davidgomes/master

Added the isometric_engine namespace and made sdl-wrapper a submodule.