Fix travis karma test that fails coz of chrome/firefox

[Rebolon]

it starts since #116
i decided to merge coz scrutinizer works well, so i can remove some test from travis (and maybe remove it or just let a .dist file coa it's not really ecologic to run both CI)

[Rebolon]

• travis fail to run karma tests
• karma window doesn't display result (except if we click on debug button). This problem already appears with karma update 3+. It seems that 4.x still doesn't fix the problem. I may need to downgrade (look at Test JS failed with Karma coz of HtmlReporter #110)