convert ip address field to charfield so it supports ports; catch errors and log them in callback view
add logging config to default settings to hide missing handler message during tests
reorganize tests into invidual modules
remove ip field, it's not needed
add release notes
Merge pull request #6 from caktus/feature/ipaddress-with-port

Remove URL field in Twilio callback
Update README.rst
remove references to ip address in admin
add docs
update version to 0.2