Remove unnecessary functions
Update several things (comments, variables names, examples) and remove SVG font format waiting to find a better solution to manage ID.
Add dot at the beginning of all font extensions used
Add is-font-face-shortened-variation function
Rewrite the bluid-font-file-name function to use shortened variations
Rewrite font-face and font-faces mixins and add explode-font-face-shortened-variation function
Update examples
Update README