Update people's page information

Please make the following changes to the page:

Add:

Jon Selon, Administrative Manager General administrative tasks, event coordination, donor management, swag management.

Cass Brewer, Writer

Brad Parker, Chief Financial and Grants Officer

Silvia Puglisi, Services Hacker Services admin, metrics team contributor, and generally helping picking up tasks around.

iwakeh, Metrics Team Developer

Change: Sue Abt, Accountant and Finance

To: Sue Abt, Accounting Manager

Change: Colin Childs, Translation Coordinator and Support

To: Colin Childs, Support and Translation Coordinator

Change: Roger Dingledine, Project Leader, Director, Research Director

To: Roger Dingledine, Research Director and President

Change: Dr. Ian Goldberg, Director, Researcher

To: Dr. Ian Goldberg, Researcher

Change: Dr. Karsten Loesing, Metrics Researcher and Developer

To: Dr. Karsten Loesing, Lead Metrics Researcher and Developer

Change: Nick Mathewson, Chief Architect, Vice President, Researcher, Director

To: Nick Mathewson, Chief Architect and Vice President

Change: Julius Mittenzwei, Director

To: Julius Mittenzwei

Change: Mike Perry, Tor Browser and Tor Performance Developer

To: Mike Perry, Tor Labs Lead and Developer

Change: Wendy Seltzer, Director

To: Wendy Seltzer

Change: Rabbi Rob Thomas, Director

To: Rabbi Rob Thomas

Change: Yawning, Developer

To: Yawning Angel, Developer

Move from Core People to Past Contributors Page:

John Brooks, Ricochet Developer Leads Ricochet, a decentralized chat system where every user is an onion service. Also a core contributor to Tor onion service development.

Marie Gutbub, Advocate Helps educate the world about the value of Tor, especially in Europe.

Tom Leckrone Helps make sure everything runs smoothly. Coordinates logistics and people and everything in between.

Kelley Misata, Advocate Teaches many people about the value of privacy, especially in the contexts of domestic violence and cyber stalking.

Andrea Shepard, Developer Works with Nick as a core Tor developer.