Merge pull request #21 from abookyun/master

Update David Yun description in English.
1. 加入sponsor(wolf-tea)
2. 移動sponsor logo 位置
3. 將sponsor appeals加進來
	modified:   css/style.css
	new file:   img/sponsors/Wolf-Tea.png
	modified:   index.html
1. Add Speaker sponsors
2. Translate all sponsor types to English
new file:   2014/img/sponsors/bundler.png
new file:   2014/img/sponsors/polyglot.png
new file:   2014/img/sponsors/xinminlabs.png
modified:   2014/index.html
Add Mobile apps link

new file:   2014/img/googleplay.png
modified:   2014/index.html
Add iOS app link
	new file:   2014/img/app_store.png
	modified:   2014/img/googleplay.png
	modified:   2014/index.html
1. Add 包子's profile pic
2. Remove Don from speaker and schedule
	new file:   2014/img/staff/lilianyu.png
	modified:   2014/index.html
Fix type, Dring -> Drink
	modified:   2014/index.html
1. Remove Don from session & speaker json
2. Fix typo
modified:   2014/index.html
modified:   2014/mobile/schedule2_hall.json
modified:   2014/mobile/speakers.json
Update DavidYun's subject in Schedule.