Instant toolbar updates

[marcobarbosa]

Some refactoring here. Before this toolbar was done pretty quickly.

• Removed selection logic since instant toolbar doesn't depend on it
• Don't show/hide the toolbar multiple times when clicking
• Show the toolbar on the parent element instead on the event coordinates
• Abstracted some functions
• Add and remove a CSS class before showing and hiding it. Very useful for a CSS3 transition.

Also in the link plugin:

• Close the toolbar when showing the dialog (shouldn't you do that?)
• Bigger dialog height

Take a look. I'm not sure if I'm supposed to include the build but it's there anyway.