Let buttons open in new tab

[danbrellis]

Looking through the source code, I see how buttons are converted to anchor tags in componentFactory.js. Yet, there is no way to set target="_blank". I think this could be an easy addition and for my purposes, useful. Basically, if I wanted to take my email and host it on my website as a sort of archive, it would be beneficial to have certain links open in a new tab.

Something simple, like this starting at line 29 under case this.components.button:

var target = '';

if (element.attr('target')) {
    target = ' target="' + element.attr('target') + '"';
}

// If we have the href attribute we can create an anchor for the inner of the button;
if (element.attr('href')) {
    inner = format('<a href="%s"%s>%s</a>', element.attr('href'), target, inner);
}

[rafibomb]

Looks there was a PR merged for this already #42
It will go out with 2.2 this month!