[Ubuntu] 安裝 compass

這裡有個快速的參考

https://gist.github.com/stephou0104/233b5c99884f1d8c8b8b

1. 先把需要的周邊套件都先裝一裝
   sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties
   
   sudo apt-get install libgdbm-dev libncurses5-dev automake libtool bison libffi-dev
    
2. 把 rvm 的環境架起來，注意的是第一步
   gpg --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
   curl -L https://get.rvm.io | bash -s stable
   source ~/.rvm/scripts/rvm
   echo "source ~/.rvm/scripts/rvm" >> ~/.bashrc
    
3. 接著就可以開始安裝ruby了

   rvm install 2.1.2
   rvm use 2.1.2 --default
    
4. ruby裝完，就能用 gem 來安裝 compass了
   gem install compass