Include build metadata in the compiled application

[chalkos]

The roda-in jar should include a version.json file containing information about the repository status at compile time.

This greatly speeds up bug fixing and support, since the developers can use this file to know exactly what code was compiled into that specific JAR file.

Extra:

• save this file (or the essential parts, eg: commit hash and if the repository had uncommited changes) to the log file on each startup.

[chalkos]

This file is already present and named build.properties.

@hsilva-keep should we output its contents (or part of them) to the log file?