Sharing metatest logic between unittest and scheduled_test

R=nweiz@google.com

Review URL: https://codereview.chromium.org//524153002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/metatest@40475 260f80e4-7a28-3924-810f-c04153c831b5
pkg/metatest: adding homepage to metatest pubspec

TBR

Review URL: https://codereview.chromium.org//585703002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/metatest@40479 260f80e4-7a28-3924-810f-c04153c831b5
Add gitignore, status, and codereview files.
Update the pubspec's homepage link.