Fix truncation of related urls urls

Previously the urls would get truncated, but there was no indicator they
were truncated. This adds an indicator.
add command that checks the state of each url belonging to a Video
fix a couple of errors with log and with missing url to check
Some initial refactoring
Create model for tracking broken links

Also add tests
Sync up travis with tox config

Queue up the headesk bashing! I'm off to battle Travis again!