garden-o-matic's commit data on summary page should not crowd itself or twitch when...

garden-o-matic's commit data on summary page should not crowd itself or twitch when hovered over.
https://bugs.webkit.org/show_bug.cgi?id=68864

Reviewed by Adam Barth.

* BuildSlaveSupport/build.webkit.org-config/public_html/TestFailures/scripts/summary-mock.js: Updated mocks to work.
* BuildSlaveSupport/build.webkit.org-config/public_html/TestFailures/scripts/ui/notifications.js: Changed the structure of commit data to keep commit revision apart from the rest of details.
* BuildSlaveSupport/build.webkit.org-config/public_html/TestFailures/scripts/ui/notifications_unittests.js: Adjusted unit tests.
* BuildSlaveSupport/build.webkit.org-config/public_html/TestFailures/styles/notifications.css: Made things look shiny.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96074 268f45cc-cd09-0410-ab3c-d52691b4dbfc