Safari 12 workaround for array.reverse caching

[karimMourra]

This PR will...

Reverse a copy of the axis array as a workaround for a bug introduced in Safari 12 (https://bugs.webkit.org/show_bug.cgi?id=188794)

Why is this Pull Request needed?

Safari 12 introduced a bug where calling reverse on an array will cache the reverse value, causing captions to jump up and down.
To reproduce the bug run the following:

for (var i = 0; i <= 10; i ++) {
	var array1 = ['one', 'two'];
	console.log('array1: ', array1);
	var reversed = array1.reverse(); 
}

notice that even though the array is being instantiated, the value is reversed even before reverse is called.

The following screenshot shows the bug in action: