Enable Travis-CI for a Github repository from the command line
Travis-CI is a Really Useful Engine, but I've only enabled it for a handful of my GitHub repositories because navigating though GitHub's settings to do so is a bit of a pain.
Seemed like this should be scriptable though - turns out it is! Edit that script to include your GitHub login details, and Travis-CI details, save it as travis-status somewhere in your $PATH, chmod +x travis-status and you're ready to go!
Running travis-status in a project's root directory (and I'm assuming the project's root directory has the same name as the repository's slug) with no parameters will print out a list of all event hooks for the project (not just Travis ones). Running it and passing "1" or "0" as the parameter will enable or disable Travis for the project.
I'm tobyink on CPAN, IRC and PerlMonks. 
I travis gem:
gem install travis
travis enable
Yes, I did initially try that, but in the end decided it would be easier to copy-and-adapt an existing GitHub-API-using script I had than it would be to figure out the cryptic error messages I was getting from
gem.