Add note about MacGDBp stand-alone graphical debugger.
Merge pull request #290 from apinstein/patch-1

Add note about MacGDBp stand-alone graphical debugger.
Merge commit '445c4e3c397469423c8b118eaf85df0a14ddef54' into gh-pages

Conflicts:
	_posts/03-06-01-XDebug.md