rspec of question_follow
Add question_follows migration
Add question_follow model
Add default value of last_view_time by migration
Add follow and unfollow methods on model
Fix follow and unfollow question
rspec of visit_question
follow question and unfollow in controller
Fix rspec of question_follow
Fix visit_question
Fix rspec
Fix rspec of question_follow
refactor question_follow rspec
refactor question_follow rspec
refactor question_follow rspec
fix question_follow rspec
Divide into different user in question_follow rspec
fix
Merge branch 'master' of github.com:mindpin/eshare