use Seq instead of List
Merge branch 'master' of github.com:vmunier/ReactiveMongo into vmunier-master

Closes #40: Seq instead of List where it makes sense.

Conflicts:
	driver/src/main/scala/api/api.scala
	driver/src/main/scala/api/indexes.scala
	driver/src/main/scala/core/actors.scala
	driver/src/main/scala/core/commands/commands.scala
	src/main/scala/bson/bson.scala