Add more past members

[tomlepaine]

On going task: Add more past members. Include:

• Name
• Job
• Email
• Url

Update: We now have a lot of names, but most don't have emails or urls, and many do not have jobs listed. Let's try to fix that.

[tomlepaine]

Updates:

• [x] Xiang Sean Zhou - Siemens
• [x] Liangliang Cao - Yahoo
• [x] Jianchao Yang - Snapchat

[tomlepaine]

Updates:

• [x] Hanning Zhou - no longer at Amazon
• [x] Henry Hao Tang - FXPAL
• [x] Jiebo Luo - Not Tom's direct student

[tomlepaine]

I added a bunch more from Atlas's list on linkedin.