Add ".scala_dependencies" file generated by Scala-IDE

This is a transient file generated by the Scala-IDE Eclipse plugin, which is regenerated on a clean build, and should not be checked into VCS.

Scala.gitignore

@@ -8,3 +8,6 @@ lib_managed/
 src_managed/
 project/boot/
 project/plugins/project/
+
+# Scala-IDE specific
+.scala_dependencies