allow PopoverTrigger component to have more flexible customization capabilities

[micross]

The PopoverTrigger component currently uses a button tag for wrapping. Could it be changed to a div or other elements to allow for better customization or provide a method to disable rendering default button?

[adoyle0]

The button requirement is because Popover uses the browser popover API, which requires a button or an input as a trigger. #22 may add this functionality when it's done though. What are you trying to do? Can you provide a snippet? I'll make it a test case.

[adoyle0]

#37 turns PopoverTrigger into just a context provider so now there's slightly more freedom for custom triggers. We can add more things to the context, such as a node ref maybe? You can also get the menu id from the context, or bring your own ids.