sbt/sbt — pull request #1249 by indrajitr (2014-04-10 08:26:54+00:00)
Title: `DefaultOptions` for resolvers should not resets existing values.

`DefaultOptions.addResolvers` and `DefaultOptions.addPluginResolvers`
should not reset the existing value while adding the new ones. The
names are prefixed with _add_ afterall.