Bump version number, upgrade stunnel, fixes comp500#15

Bump version number

Bump version number

Bump version number

Bump version number, upgrade stunnel, fixes comp500#8

Set default version code to 0, so update occurs properly

Reextract stunnel binary when the app is updated

Change type to release, so that signing config will actually be used

Actually add a signing config

Sign with debug key, encrypted for Travis CI