updated Google Play description (4000 char limit)
commit Google Play ChangeLog
CreateKey and ReceiveKey use keyserver from app settings
bump to version code 5 name 0.3.1
jenkins-build.sh: set the version code and name based on current date

This will differentiate the debug builds from the normal builds. The debug
builds will never be upgraded by the release builds since the debug builds
will always have a much larger versionCode.  Also, the date it was built
will show up in the version string, making it easier to identify debug
builds versus release builds.