cartel.py Removed reachability code, it's been moved the the reach library.
cartel.py Updated to the new reach library.
README.md Updated to new version and modified date.
requirements.txt Added reach library.
setup.py Updated version.
	modified:   README.md
	modified:   cartel.py
	modified:   requirements.txt
	modified:   setup.py
Add incremental backoff. Updated the number of attempts.
	modified:   cartel.py
Added handling httplib.HttpExceptions.
Imported urllib.URLError with from ... import ... format.
Incremented version to 0.4.3.
	modified:   cartel.py
	modified:   setup.py