Matt's edits (sent by email)

Signed-off-by: Martin Evans <martindevans@gmail.com>
Added a post about pathfinding

Signed-off-by: Martin Evans <martindevans@gmail.com>
Merge branch 'To_Be_Proof_Read' of github.com:martindevans/martindevans.github.com into To_Be_Proof_Read

Conflicts:
	_posts/2013-03-20-Valve-Need-To-Stop-Reading-My-Mind-(And-Other-Miscellania).md