Add skip btn for instructions
Added api for fixing resotration of compressed checkin in TwitterAccount.
UI: Directing assessors to instruction everytime.
Update survey and make the home page the instruction
Add testing codes based on casperjs
Rename task_router to pagerouter and move taskpackage assignment into pagerouter
Move the control of showing instruction and survey into cookies.
Minor fixes
Fixes extra sliding when click skip button
Adapt the height of iframe
Minor fixes
Disable Twitter login
Remove global dependency on foursquare
Add example questions to topics
Fix missing example question on UI
Fix duplicated filters for annotation view
Update dc.js to 1.7.2 (spacelis/dc.js)