chore(travis): disable IE8 tests
chore(travis): disable IE8 tests

Chai fails on IE8, so I’m disabling IE8 tests on Sauce Labs. This
should fix Travis that’s currently failing.

MartinSandstrom/angular-apimock,seriema/angular-apimock,MartinSandstrom/angular-apimock,seriema/angular-apimock