Merge pull request #3 from ellisonleao/heroku-button

Merge pull request #4 from Xuefeng-Zhu/patch-2

minor optimization for adding questions to resp_qs

adding information about SE_KEY on deploy to heroku button section

fix app.json

adding Deploy to Heroku Button

fix unicodeerror and show an error instead

importing os is needed

helpful message when no questions

that is not installation

add thorough install instructions

add demo gif

bind to heroku port

fix env

add a procfile for heroku