useBundles setting ignored

I was digging around trying to work around #90, so I tried to use the useBundles setting and noticed it seems to have no effect.

I put a breakpoint at

karma-systemjs/lib/adapter.js

Line 164 in 22c0f98

if (!karma.config.systemjs.useBundles) {

and saw that the useBundles property was not set.

It seems that only the properties set at

karma-systemjs/lib/framework.js

Line 263 in 651750b

config.client.systemjs = {

are persisted.

So this if block checks for the existence of a property that will never exist, and therefore runs unconditionally - and throws an error in SystemJS 0.20.

[AdamWillden]

@errorx666 thanks for pointing this out. It helped me create #92