html5 attributes support

[basz]

{{#bs-button title="Cancel what you are doing..." type="default"}}
    Cancel
{{/bs-button}}

renders as;

<button id="ember1391" type="button" class="ember-view btn btn-default">
    Cancel
</button>

simply adding 'title' to attributeBindings in addons/components/bs-button solves it.

attributeBindings: ['disabled', 'buttonType:type', 'title'],

But there might be more attributes; http://www.quackit.com/html_5/tags/html_5_global_attributes.cfm

Is there a reason these (or a subset of) are not implemented? I can easily create a PR, but I can't do tests and I would like to know if it would considered at all...