Add new credit card component

[joshsmith]

Problem

We want to create a new credit card component to add your card information, as seen on https://projects.invisionapp.com/share/SP8PSQGNM#/screens/191332630

Subtasks

• Show all credit card icons (can share exports of these) - Add new card component #668
• Fields for card number, MM/YY, CVC - Add new card component #668
• Link to terms of use - Add new card component #668
• Generate stripe token for card when pressing donate - Add new card component #668
• Pressing donate takes Stripe token and POSTs to server to create subscription - Add new card component #668
• Pressing donate button shows loading state; changes on error or success - Add new card component #668
• Create credit card for user when submitted. List created cards if any. - Add new card component #668

Moved to #669

• Uses ember-stripe-service to generate client-side errors per input field
• Shows server-side errors on input fields, where appropriate
• Use existing code from another project we've done for some of the fields
• Highlight inputs in red when they have errors
• Add error information below each input when errors are present
• optional Credit card highlights as the correct one when entered

[sbatson5]

@joshsmith do you have an export of the credit card icons?

[joshsmith]

@sbatson5 I do!

[joshsmith]

credit-card-icons.zip

[sbatson5]

@joshsmith Do you have an export for the input icons?

[sbatson5]

Also, what are we using for input validations on this repo?

[joshsmith]

@sbatson5 I would like to use ember-changeset with ember-changeset-validations. Think there's an issue regarding bringing those in. #609