Add info and debug output

[antisnatchor]

Add a CommonUtil class that will contains for now the following methods:

print_info
print_debug

These will be used to print messages on the console, while watchtower is parsing the code and generating the report.

So print_info something like:
[+] Parsing files
[+] Generating report

Andprint_debug something like:
[D] 100 Java files found (for example)

IT would be nice to have the time as well, at the left of the [+] [D] strings