Fixed typo on transform-origin

I've fixed a typo for transform-origin, so that elements can be scaled in the correct direction properly.

*Note:*: However, I've noticed that the computed WebKit Matrix doesn't currently take the origin into account. Therefore, when the 'new matrix' is applied once an animation is complete, the origin is no longer taken into account, and the View snaps.

*Edit:* It seems like my CoffeeScript compiler has some differences to yours. Sorry for the noisy git commit.