Missing resolver in plugin settings

When the project is built by SBT, it fails because there is no resolvers in project/plugins.sbt.

If you have no corresponding jars in $HOME/.ivy2/cache, sbt will says like:

sbt.ResolveException: unresolved dependency:
com.typesafe#jse_2.10;1.0.0: not found
unresolved dependency: com.typesafe#npm_2.10;1.0.0: not found
unresolved dependency: com.typesafe#webdriver_2.10;1.0.0: not found
...

This problem will be fixed easily by adding this line into project/plugins.sbt:

resolvers += Resolver.typesafeRepo("releases")