Merge pull request #73 from genewoo/master

change address and update date
Add <Ruby under a microscope> Slides
Add Teddy's TPP
add spots photos
Merge pull request #75 from zhouguangming/master

Add spots photos
Merge pull request #74 from bachue/add-slides-to-call-2014-feb-weekend

Add <Ruby under a microscope> Slides