Remove unused images
Update introduction and remove unwanted CSS
Add link 'Return to top'
Add a navigation bar
Update HTML5 Shiv
Add HTML5 Shiv to Sandstone
Only load HTML5 Shiv for IE6-8
Fix link 'Return to top'
Remove unwanted images
Repair Sandstone wiki link
Replace footer logo
Fix MozTW link
Remove Personas introduction
Apply background and navbar styles
Apply navbar styles
Apply 'Return to top' image
Adjust navbar styles
Add screenshots
Merge branch 'master' of https://github.com/moztw/central into br_update_fx_tw_wording