Refactoring atributes Model (cache is broken)
Creating Memory leak metric
Created two security metrics:

- Dereference of null pointer
- Assigned undefined value
Created Return of Stack Variable Adress metric
Cleaned code and fixed identation
[broken] Inserting flags in extractor
Fixing flags of metrics command

Refactoring system call in Clang extractor
Fixing acceptance test
Adding the new metrics flags in help documentation