Ability to pass options to stripe.elements()

Hello! Thanks for creating this addon, it's awesome.

Is there a way to pass the `options` hash on init to `stripe.elements(options)`? This is different than the per-element options hash.
https://stripe.com/docs/stripe-js/reference#stripe-elements

I believe the init is this line: https://github.com/code-corps/ember-stripe-elements/blob/0.3.0/addon/components/stripe-element.js#L16

Read addon/components/stripe-element.js at line 16 and compare its initialization with the Stripe Elements reference linked in the issue. Trace how initialization options differ from per-element options, then verify that supplied options reach stripe.elements(options) while existing per-element behavior remains unchanged.

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