Removal of dead code & Refactor of FindbugsMetrics | 4003055 - 4005996

This pull request contains 2 parts
- Removal of dead code in the Alitheia Core project
- Refactor of FindbugsMetrics class

A report can be found here:
https://github.com/delftsre/assignments-2013/blob/master/4003055-4005996/report.md