[dirbuster] Add support to dirbuster.
[nmap] Add support to nmap (no ranking yet).
[readme] udpate usage example.
[w3af] Latest version is supported.
[wapiti] Fix wapiti 2.3.0 report parsing (#1).

Instead of only checking that the report contains the `vulnerability` sections,
it ensure that these sections contain non-empty `entry` sub-sections (which
represent the actual discoveries/vulnerabilities).
[wapiti] Support 2.2.1 Wapiti version.
[dirbuster] Add typo in regex.

The current version of Dirbuster generates a typo in its reports with "Files
found with a 200 respon**c**e:** instead of "Files found with a 200
respon**s**e:"
[dirbuster] Fix mismatching prototypes.
[dirbuster] Update report filename regex.

The reports automatically generated by dirbuster has the prefix
"DirBuster-Report" by defaults.
Therefore I updated the report filename regex's default value in order to match
the most general case.
Update of the readme's supported tools list.
[wapiti] Add report example for the 2.2.1 test case.
Merge branch 'develop'

Conflicts:
	README.md
	libptp/tools/dirbuster/parser.py
	libptp/tools/dirbuster/report.py
	ptp.py
	tests/dirbuster/test.py
[dirbuster] Remove old test reports.