When doing svn log -qr HEAD trunk/url, a log message with revision will not show if the last commit was not in the trunk/ path.
When doing svn log -qr HEAD trunk/url, a log message with revision will not
show if the last commit was not in the trunk/ path.

For example, changeset [4045] is for scriptaculous, so the command executed by
rails:freeze:edge:

svn -qr HEAD log http://dev.rubyonrails.org/svn/rails/trunk

Yields the following output:
------------------------------------------------------------------------

Causing the regex to bomb.

Change the command to use --limit 1 instead of HEAD, which will pick up the
last changeset against the trunk path.

Fixes #4356


git-svn-id: afc9fed30c1a09d8801d1e4fbe6e01c29c67d11f@4046 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

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