Multiple imports not possible

[ithie]

As mentioned in the readme it should be possible to use multiple "#import"-statements.
But currently only the first "#import"-statement will be resolved.

The "global"-Flag is missing here:
https://github.com/namshi/mockserver/blob/master/mockserver.js#L84

Is this intended?

[ithie]

I've created a pull-request with a possible fix. (#69)