Lots of progress on WordPress -> Jekyll migration

 - Migrated a bunch of old posts – 36 down, 70 to go.
 - Cleaned up some special characters, relying on rdiscount's smart extension to make them pretty again.
 - Added WordPress images, and added an S3 rewrite rule to fix old URLs (of which they're probably aren't many in the wild) – see the README.
 - Added post updates, thanks_notes, and some other stuff.
 - Some other stuff.

Note the weird git warnings from embedded SVN repos, I think. I'm going to ignore them for now:
	[master 0dc21cc] Lots of progress on WordPress -> Jekyll migration
	warning: CRLF will be replaced by LF in source/projects/fall09/mashups/gheat/etc/.svn/text-base/apps.conf.svn-base.
	The file will have its original line endings in your working directory.
	warning: CRLF will be replaced by LF in source/projects/fall09/mashups/gheat/etc/apps.conf.
	The file will have its original line endings in your working directory.
Updated subproject repo with origin commits

Otherwise I was getting an annoying message in git status that I couldn't get rid of:

	modified:   source/projects/fall08/ajax/keyboard-portfolio (modified content)