Bug 899574 - Add public API for resolving promises in C++. r=baku
Bug 899574 - Part 2, add Notification.get() with notification storage. r=bent

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rename : dom/tests/mochitest/notification/create_notification.html => dom/tests/mochitest/notification/desktop-notification/create_notification.html
rename : dom/tests/mochitest/notification/notification_common.js => dom/tests/mochitest/notification/desktop-notification/notification_common.js
rename : dom/tests/mochitest/notification/test_basic_notification.html => dom/tests/mochitest/notification/desktop-notification/test_basic_notification.html
rename : dom/tests/mochitest/notification/test_basic_notification_click.html => dom/tests/mochitest/notification/desktop-notification/test_basic_notification_click.html
rename : dom/tests/mochitest/notification/test_leak_windowClose.html => dom/tests/mochitest/notification/desktop-notification/test_leak_windowClose.html
rename : dom/tests/mochitest/notification/test_notification_tag.html => dom/tests/mochitest/notification/desktop-notification/test_notification_tag.html
rename : dom/tests/mochitest/notification/test_system_principal.xul => dom/tests/mochitest/notification/desktop-notification/test_system_principal.xul