feature of answer and answer rate
Merge pull request #114 from hlee/master

feature of adding answer and answer rate
Fixed #97
Merge pull request #113 from caok/master

refactor tag Fixed #103
add user count summary
Merge pull request #115 from hlee/master

#97 again for user count
assets for heroku
remove assets
refact the name of the helper
Merge pull request #117 from hlee/master

refact name for rspec
spec for helper
Merge pull request #118 from hlee/master

rspec for helper
Fixed #116
integration rspec for question
Merge pull request #121 from hlee/master

integration test
Fixed #116, #119
modify viewed_count