The build scripts broken due to scripted-plugin dependency changes. 

1. change the dependency to fix the build 
2. add scala version to allow it to run for Scala-2.10.0
3. add build.properties for sbt 0.12.2

the detailed changes: 
https://github.com/chesterxgchen/sbt-dustjs/commit/881884e44d4d2260eb957fbce71f7198bbc15ba6