Add the 'milestone' property for Radar and GitHub. For now, make this property read-only.
<rdar://problem/104147220>
Pull request: https://github.com/WebKit/WebKit/pull/8553
Committed 258831@main (13d9ff026e75): <https://commits.webkit.org/258831@main> Reviewed commits have been landed. Closing PR #8553 and removing active labels.
Re-opening for pull request https://github.com/WebKit/WebKit/pull/8880
Committed 259140@main (d6ca4dc5452a): <https://commits.webkit.org/259140@main> Reviewed commits have been landed. Closing PR #8880 and removing active labels.
Committed 252432.1038@safari-7614-branch (1d0ebb722153): <https://commits.webkit.org/252432.1038@safari-7614-branch> Reviewed commits have been landed. Closing PR #301 and removing active labels.