TinyMCE, add "select class" to the Image pop-up

[azaozz]

This patch adds the "Class" drop-down to the "Image" pop-up in TinyMCE 3.0. The classes shown there are defined in "tinymce/wordpress.css". They should also exist in the theme's style.css, so only common classes like .alignleft and .alignright can be added.

[ryan]

(In [6764]) add "select class" to the Image pop-up. Props azaozz. fixes #5803

[azaozz]

Reworked the patch. This would be much easier to use. It automatically adds class="alignleft" or "alignright" when float left/right is selected for the image. It also falls-back well: If the classes aren't defined in style.css, the float still remains.

[ryan]

(In [6769]) Automatically add classes to images for floated images. Props azaozz. fixes #5803

[Viper007Bond]

Sweet. No more having to add padding to all images in posts or fixing screwed up posts for my clients. :D