update karma config
update karma config

- more clarity around what's happening when it's happening
- attempting to ensure PR builds from `mochajs/mocha` branches will run SauceLabs; previously only the "branch" build was running

villesau/mocha,villesau/mocha,santiagoaguiar/mocha,boneskull/mocha,villesau/mocha,JohnnyEstilles/mocha,sul4bh/mocha,Khan/mocha,Khan/mocha,apkiernan/mocha,adamgruber/mocha,Hacker0x01/mocha,sul4bh/mocha,apkiernan/mocha,santiagoaguiar/mocha,JohnnyEstilles/mocha,Hacker0x01/mocha,rlugojr/mocha,adamgruber/mocha,menelaos/mocha-solarized,rlugojr/mocha,mochajs/mocha,nightwatchjs/mocha-nightwatch,beatfactor/mocha,hoverduck/mocha,mochajs/mocha,igwejk/mocha,hoverduck/mocha,outsideris/mocha,menelaos/mocha-solarized,JohnnyEstilles/mocha,menelaos/mocha-solarized,nightwatchjs/mocha-nightwatch,Khan/mocha,nightwatchjs/mocha-nightwatch,beatfactor/mocha,hoverduck/mocha,hoverduck/mocha,apkiernan/mocha,boneskull/mocha,santiagoaguiar/mocha,adamgruber/mocha,boneskull/mocha,Hacker0x01/mocha,sul4bh/mocha,igwejk/mocha,outsideris/mocha,beatfactor/mocha,mochajs/mocha,rlugojr/mocha