Generate fully qualified names for Scala's collection classes. If a proto definition has a namespace that contains a child namespace called "collection", then the generated Scala files will fail to compile since it will try to look for "collection.immutable.Seq" in the child namespace and not in "scala" namespace. Fully qualifying resolves this issue.
Merge pull request #74 from lambdaknight/master

Generate fully qualified names for Scala's collection classes.