install Scala

1. www.scala-lang.orgからDLして解凍
2. mv scala/ /usr/local/
3. add followings to .zshrc

export PATH="/usr/local/bin:/usr/local/sbin:/usr/bin:/opt/local/bin:/opt/local/sbin:/opt/local/lib/:.:$HOME/Dropbox/lib:$SCALA_HOME/bin:$PATH"
export SCALA_HOME="/usr/local/scala"

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