[dirbuster] Add entries in signatures database.

Thank you Tedi for the list :)
[owasp] Add support to OWASP-CM-008 test.
[robots] Add support to robots.txt files.
Update list of supported tools.
[doc] Add doc new supported tools.
Add ctags file in the gitignore
Homogenized functions prototypes.
Update modules docstrings.
Remove useless __str__ functions.
[metasploit] Reformat signatures dict.
[doc] Add getting started section.
[doc] Update version numbers.
[doc] Update technical doc.
[doc] Move technical doc to another section.
Better exception handling for txt files.
Better exception handling for XML files.
Remove unused imports.
[exceptions] Update docstrings.
[parser] Update docstrings.
[report] Update docstrings.