Try to name Captions classes

Hey guys,
i made a try to name caption's names instead of having `effeckt-caption-10`, e.g.

Some notes though,
* I don't know what 'sqkwoosh' is so i left it for somebody else, since i can't come with a nice name for that transition
* SASS compiler kept giving me errors [here](https://github.com/h5bp/Effeckt.css/blob/gh-pages/scss/modules/page-transitions.scss#L313). i had to get rid of the two values to make the compilation. i am not sure why though :(
* Having a gh-pages branch to work with it's really difficult. What's is your usual workflow, maybe i am doing something wrong? I mean in every commit it has to contain all the builded files? Shouldn't be more practical to keep only compiled files in the gh-pages branch and a master branch with the actual sources?

Enjoy your weekend! :)