Bugfix: when submitting tasks with empty timeout or priority, the database threw a type error
Fix: default timeout value should be 0, not ""
Show error message when db.add_path() returns None
Merge branch 'development' of https://github.com/cuckoobox/cuckoo into bugfix_in_add

Conflicts:
	utils/web.py
Merge pull request #96 from pdelsante/bugfix_in_add

Bugfix when submitting tasks with empty timeout or priority