Custom event names can't contain spaces

[timmywil]

Ported from http://bugs.jquery.com/ticket/14357

Just need to add a note to the necessary pages (on, off, trigger mainly I think).

"Since space is used as a delimiter for multiple event names, spaces cannot be used."

[dmethvin]

Even better, lets say what they can contain to avoid further complaints of this sort. So, [a-zA-Z0-9_:-] perhaps. Due to the way the old live() code worked some chars like ~ haven't worked consistently across versions anyway.

I could have sworn we documented this before, or at least had an issue for it.

[timmywil]

Yup, you did this: 6bd59cb