allow other phantomjs command line arguments
allow other phantomjs command line arguments

There are several features in PhantomJS that can only be controlled by
command line arguments. For example, without `--local-storage-quota` and
`--local-storage-path` you can't test any local storage features.

This change allows passing arbitrary argument through to phantom when it
is launched by testem. In your testem.json you would do:

    "phantomjs_args" : [
      "--local-storage-path=/tmp/phantom",
      "--local-storage-quota=100000"
    ]

fotinakis/testem,testem/testem,bradleylandis/testem,bradleylandis/testem,johanneswuerbach/testem,johanneswuerbach/testem,fotinakis/testem,bradleylandis/testem,testem/testem,paulot/testem,testem/testem,paulot/testem,Addepar/testem,johanneswuerbach/testem,Addepar/testem,Addepar/testem,fotinakis/testem,paulot/testem,Addepar/testem