Check that the document has element on clickaway

[alexprice1]

This is for the click-away mixin. I have this click-away mixin for one of my components. In this component I am removing an element, and that element is being removed on click.

React removes this element before the event is bubbled up to click-away. I added 'document.contains(e.target)' to make sure the dom element is in the document prior to saying the user clicked away. This might want to be looked at some more...

[alexprice1]

If this ever becomes an issue for anyone, we could remove this check, but when we call this.componentClickAway we could pass in e.target, that way the user can check if the document contains the element:

componentClickAway: function(target) {
if(document.contains(target) {
//continue
}
}