save user phone.
add user phone feature test.
add user phone javascript test.
wait 60 second to re-send the phone code.
user phone code can send 10 times a day.
show user phone blank notification.
remove logger.
merge master.
upgrade capybara to fixed:      Capybara::Ambiguous:
       Ambiguous match, found 2 elements matching button "获取短信校验码"
test system notfication.
update china_sms version to v0.0.4, fixed error: 'invalid parameters'
update settings, add empty sms config for test and development env.
Merge pull request #399 from saberma/saberma-feature/390-use-sms-to-valid-phone

提醒用户绑定手机 #390