Add Joerg Platzer and Mike Caldwell to the people page.

They both have solid track records of appearing in the media and
have both created projects that make Bitcoin look great (Room77/Bitcoin
Kiez and the physical coins respectively).
Merge pull request #155 from mikehearn/morepeople

Add Joerg Platzer and Mike Caldwell to the people page.
Add Vitalik Buterin and fix some typos and pictures colors
Merge pull request #157 from bitcoin/vitalik

Add Vitalik Buterin to the Press Center
Use "Core developers" and "Bitcoin-Qt contributors"
Send User-agent header to github API
Send User-Agent header to github (fixes FTBFS due to 403 HTTP error)
Add links to the development mailing list and IRC, as well as a web-irc link (thanks gmaxwell) (fixes #153)
Proofread changes (thanks Arran Walker) (fixes #156)
Update to the statistics and cleaned up the language (thanks Trace Mayer) (fixes #143)
Update Vitalik email address
Fix one inaccuracy in the FAQ
Handle urls translations automatically in pages
Internal page urls are now all declared once in _config.yml for each language
Translators can translate file and anchor urls without needing to manually update all pages
Merge pull request #160 from bitcoin/dynamicurl

Handle urls translations automatically in pages
Fix random order in the menus in older jekyll versions
Add back Bitcoin2013 conference banner
Add The Guardian video on the Bitcoin Kiez (fixes #163)
Add Dutch (nl) translation (thanks whenlit and Boris Hupkens van der Elst) (fixes #141)
Merge pull request #168 from bitcoin/nl

Add Dutch (nl) translation (thanks whenlit and Boris Hupkens van der Elst) (fixes #141)
Fix language menu order in older jekyll versions
Standardize ALERTs between layouts