Include the lib/ folder when building the JAR for dk.itu.coqoon.core

Commit 36562a882202ea09aa8f3ca519e1a0ddbbbcad7f correctly added this folder
to the build.properties file, but the build shell script doesn't actually
use that. Oops!
Bumped the version numbers to 0.4.4.3 and added a changelog entry