contrib.texi (Contributors): Add John David Anglin and Loren J. Rittle (the latter also to Testers).

	* doc/contrib.texi (Contributors): Add John David Anglin and Loren
	J. Rittle (the latter also to Testers).  Update David O'Brien's entry.
	* doc/contrib.texi (Contributors): Add David O'Brien.

From-SVN: r52024