Revert "Upgrade to 7.1, add access to UI"

This reverts commit fe922a8dd1ff0854a600441d6ee68ba9f9496318.
Vaadin version -> 7.0.5
Better setter support for ScaladinItem, ScaladinItem supports propertyIds as a constructor argument, refactoring
Merge branch '3.0' of https://github.com/henrikerola/scaladin into 3.0
alignment => get/setAlignment
wrong instance passed to createProperty
Fixed getType to return correct type
Created package vaadin.scala.server and moved some classes there
Moved Layout to its own file and moved SpacingHandler, MarginHandler and AlignmentHandler inside Layout
Moved HasComponents to its own file
Moved Margin to Layout.Margin
Moved AbstractComponentContainer to its own file
Moved SingleComponentContainer to its own file
Moved AbstractLayout to its own file
Moved AbstractSingleContainer and SelectiveRenderer to their own files
Replaces Manifests with ClassTags
Update Build.scala

javax API put in the provided scope.
Merge pull request #23 from antoinecomte/3.0

Update Build.scala
Fixed SNAPSHOT version
Possibility to publish snapshots to github maven repo