Fix tests failing with .bin/karma: No such file or directory

I try to run tests like this:

    npm install
    make test

It fails with:

    ==> [Test :: Karma (PhantomJS)]
    make: ./node_modules/.bin/karma: No such file or directory
    make: *** [test-phantom] Error 1

Using `karma` version 0.10.x instead of canary fixes it for me.