1. Install Xcode
2. $ curl -L https://get.rvm.io | bash -s stable
3. $ source ~/.rvm/scripts/rvm
4. $ rvm -v 可选
5. $ rvm list known 可选
6. $ rvm install 2.0.0 因Xcode更新，会有类似_utimensat symbol not found
需补充执行 xcode-select --install
7. $ rvm 2.0.0 --default
8. $ ruby -v
9. $ gem -v
10. $ gem source -r https://rubygems.org/
11. $ gem source -a https://ruby.taobao.org 替换网址，通过gem sources -l检查
Any questions, please feel free to contact zak.zhao77@gmail.com, thank you!
