Multiple dragged elements are now highlighted on other screens and their position is persisted in the database.
Pressing Space on body opens up the chat  and pressing Ctrl+A selects all elements.
Empty chat messages (or all whitespace) are no longer sent.
Pressing Escape while having focus on the chat text field closes the chat.
Updated jquery.xselectable.
Updated jsPlumb to 1.4.0-RC1.
Minor jsPlumb changes.
Add endpoint's cssClass to its copies.
Updated jsPlumb.
Added endpoints rendering.
Don't emit `element.drag` if element's positions weren't changed.