* Open backup challenge screen, prompted from notification, in browser window
* Remove no longer used showingSeedPhraseBackupAfterOnboarding related code
* Make incremental-security.spec.js click through the seed phrase success screen
* Replace use of backup-notification with use of home notification
* Pin notifications relative to window
* Remove unneeded isRequired condition on some home.component properties
* Refactor rendering of home notifications
* UX for multiple notifications
* Adds dismissal to provider request notification.
* Fix test failures
The e2e tests have been updated to reference `home-notification`
classnames instead of the removed `background-notification`. The
active tab proptypes and default values were updated as well.
* Implements ability to defer seed phrase backup to later
* Adds incremental-security.spec.js, including test dapp that sends signed tx with stand alone localhost provider
* Update metamask-responsive-ui for incremental account security changes
* Update backup-notification style and fix responsiveness of seed phrase screen
* Remove uneeded files from send-eth-with-private-key-test/
* Apply linguist flags in .gitattributes for send-eth-with-private-key-test/ethereumjs-tx.js
* Improve docs in controllers/onboarding.js
* Clean up metamask-extension/test/e2e/send-eth-with-private-key-test/index.html
* Remove unnecessary newlines in a couple first-time-flow/ files
* Fix import of backup-notification in home.component
* Fix git attrs file
