[#457] Add property apkS3Path to appengine-web.xml
[#457] Create DeviceApplication entry for new APK version

* when we have a new apk version, this rest API is called with the new version number as parameter.
[#457] Enable /deviceapprest endpoint

* this endpoint refers to DeviceApplicationRestService
[#457] Add autoUpdateApk property to appengine-web

* When autoUpdateApk = true, the server will respond
to requests from the device for the latest ape version.
If it is false, it will just return null.
[#458] Add uuid to surveyInstance when created at import

* When a surveyInstance is created through an import, we
add a uuid.
Merge branch 'feature/457' into develop