Added myself as a committer.

Unreviewed.

* Scripts/webkitpy/common/config/contributors.json:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@173511 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[GTK] Layout Test http/tests/media/hls/video-controls-live-stream.html is flaky
https://bugs.webkit.org/show_bug.cgi?id=134575

Unreviewed, marked the test as slow.

* platform/gtk/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@173512 268f45cc-cd09-0410-ab3c-d52691b4dbfc