FROM: http://www.4wei.cn/archives/1002417
sbt運行時經常需要下載大量的jar包，默認連接到maven官網，速度通常比較慢。
在`~/.sbt/`下添加一個`repositories`文件，里面內容如下：
[repositories] local osc: http://maven.oschina.net/content/groups/public/ typesafe: http://repo.typesafe.com/typesafe/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext], bootOnly sonatype-oss-releases maven-central sonatype-oss-snapshots