Tutorial

Most of this pull request is adding the new "tutorial" files. But there are some changes to the PlusSlider js code as well:

* Do not add container id as class on plusslider-wrapper.
* Removed width and height js options.
* Removed paginationTitle js option, now just checks if data-title attribute exists or not.
* Fixed issue where fader type was not getting slide width/height set like slider type was.
* Fader now fades out last slide as it fades in new slide (so it looks better with slides of different sizes); also refactored out some duplicate code between slider and fader type.
* Set display:block style on slides in javascript code, so it does not need to be in CSS.