Merge pull request #79 from fastnsilver/master

Fix flaw in presenter that could cause unintended shared state.
Merge pull request #80 from fastnsilver/master

Fix bootstrapping of mvp-sample after update to spring-vaadin-mvp
Merge pull request #81 from fastnsilver/master

Update dependencies on Vaadin from 7.3.0.rc1 to 7.3.1