update to 7.3.1 also in the mvp-sample
Merge pull request #82 from christoph-frick/doc-fixes

make the version in the code of the readme also 0.0.3-SNAPSHOT
Merge pull request #83 from christoph-frick/update-mvp-sample-vaadin-7.3.1

update to 7.3.1 also in the mvp-sample
Merge remote-tracking branch 'upstream/master'