[TASK] Add payments/payment-detail submodule for displaying ripple payment details
[TASK] Add payments module to display recieved/sent ripple payments
[TASK] Add bootstrap sass
[TASK] Add payments/payment-detail submodule for displaying ripple payment details

[TASK] Decode memos in payment detail
[TASK] Add payments module to display recieved/sent ripple payments

[TASK] Convert send payment form to be a modal
[TASK] Update README with usage instructions and development notes
[FEATURE] Add username field to login for gateways with custom domain