modified to eliminate test duplication by using shared example.
Finish user signup Chapter7
Add SSL in production
modified installed gem
comment out sqlite3 from Gemfile
Chapter7 Exercise1 done.
Chapter7 Exercise2 done. (error message test)
Merge pull request #7 from gs3/exercise-7-6-2

@adarapata チェックありがとうございました！mergeします。
Finish sign in - Chapter8
Merge branch 'master' of https://github.com/gs3/sample_app
modified Gemfile to deploying app to heroku
Chapter8 section3 Cucumber introduction done.
Chapter8 Exercise1 done.
Merge pull request #8 from gs3/exercise-8-5-1

Chapter8 Exercise1をマージします。
commit for pair programming
サインイン後に、元いた場所にリダイレクトする
Merge pull request #9 from kentaro/updating-users

ありがとうございました！
Finish user edit, update, index, and destroy actions - Chapter9
modified Gemfile to deploying on heroku
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