A Bunch of Fixes

Things we fixed

We mainly improved on the Jest integration which we introduced in v1.2.0

• Total overhaul of theconfig thanks to @Akryum (#1074)
• add support for async imports in jest ( #1075)
• made jest ignore any tests in /test/e2e to prevent accidental runs of *spec.js files meant for nightwatch (b14a70a)

Other

• It seems we forgot to actually pass the cacheBusting option we introduced to vue-loader (9f51df9)
• When the new error notification is enabled, it no longer breaks the build process when the error doesn't provide a filename. (#1070, @wolfstark)

Things we improved

• webpack-dev-server now serves compressed assets, and some other small refactors (472c561)

Things we reverted / removed

• #997 actually leads to bigger file sizes in the bundled output, and bundle file names shouldn't be too important in production, so we reverted it (#86, @c0defre4k)