Added Editorconfig and TODO.md
Updated docs
Added _tint() and _shade()
Small change in the IF statement

Since Sass can’t decide if index() will output false or null, I will
not rely on it
Changed shorthand from _gl() to _g()

A shorthand is supposed to be short amiright?
Grid stuff is now in grid/
Moved to fx/
Updated paths
testing 52367
Update