Rename yav.js to Yav.yav.js
Update karma sources

Stop to look for yav.js, it doesn't exist
Prevent naming conflicts by case

Hello, Windows, I'm looking to you!

Some Mac setups could also complain about case names. To antecipate headcaches,
yav.js shouldn't exist. It sources will lie under Yav.yav.js as any other
scripts