cleans up unused imports and applies pep8 formatting where needed.
Fixes #15. Moves LIB_PATH constant out of service modules to generic_service. LIB_PATH is now static_path, which points to enumerator/static/.
Fixes #18. Refactors all service classes under a common services/ module. Moves service_modules out from delegator.py in favor of an import to services module.
Closes #20. Catches file not found and gracefully notifies the user that the tool doesn't exist.
Closes #13. Stealth mode is now a configurable option at runtime.
Merge pull request #21 from stevecoward/master

Lots of updates, see below