Add shorthands for transformations

[jhuon]

Hello,
I wrote some shorthands for CSS functions defining transformations.
I use it myself and I'm not sure if it's appropriated for Bootstrap but I just wanted to let you know.
It's my first fork and it's my first pull request, so I hope I'm doing it fine :)

[fat]

this is very interesting - thanks for the pull request!

[mdo]

Indeed, looks like a powerful set of mixins! Will dig into these and see how we can best include them. It won't make it into master just yet—we're working on the 2.0-wip branch now and should have something released for that soon.

I'll leave this pull open for now and we can revisit it then to incorporate :).

[thomasfr]

There is also a collection of cool CSS3 only animations available as animate.css : http://daneden.me/animate/
Maybe this could be added too?

[jhuon]

Why not? Personally I like this kind of stuff :)
If you are interested, I also wrote some mixins for creating drop-shadow effects without image : https://github.com/jhuon/bootstrap/blob/shadows/lib/shadows.less

[thomasfr]

@jhuon Nice. Thanks!

[mdo]

@thomasfr: Open a separate issue for the animate.css stuff, please, and I'll see where that fits in with our plans moving forward.

@jhuon: It's fine to do the advanced CSS3 stuff, but it doesn't feel like we're getting anything by falling back to something that works in fewer browsers than javascript. It's not likely that javascript is disabled as well.

[jhuon]

@markdotto: You're absolutely right. Actually, I wrote this stuff basically for my needs, for testing purposes. This is clearly not something you want to use every day. But I had a dream that one day maybe, when all browsers will be fully CSS3 compliant, we'll get an easy to use animation framework from you guys! :)