Change file extension to GSS and thoughts

@christiangoudreau @jDramaix @Larry006 Also, should we rename this repo to GSS Grid instead of GWT Grid?

Thinking about it, I would see something like GSS Steroids, with a folder for Grid, a folder for Mixins, etc. A package of plugins where you can decide to add all of them in your project, or pick only the ones you need, like the jQuery UI. One site to rule them all, too. People coming on GSS Steroids for the mixins will see that we also have a grid system. We need to focus on developing one thing, not a thousand things, because we will always need to push a thousand things. If we go in a package way, if one small part of the package gain attention, all of the other parts will benefits from it.

It would be GSS Steroids, which include Grid, Mixins, and other fun stuff. If you only want the grid, it is still GSS Steroids, but only with the gris system part.

What are your thoughts on that?