Cannot handle 'apiPath' with slashes e.g. 'api/v1'

[hellogerard]

Hello,

Thanks for the great package. Since upgrading to Meteor 0.6.5, collection-api does not handle an API prefix with a slash, e.g. 'api/v1'. I think I've identified a couple places that need to change.

Line 63 changes from this:

      if (req.url.split('/')[1] !== self.options.apiPath) {

to something like this:

      if (req.url.slice(1, self.options.apiPath.length + 1) !== self.options.apiPath) {

And line 97 from this:

    requestPath = self._requestUrl.pathname.split('/').slice(2,4);

to something like this:

    var apiParts = self._server.options.apiPath.split('/').length + 1;
    requestPath = self._requestUrl.pathname.split('/').slice(apiParts, apiParts + 2);

Feel free to improve upon the code.

Cheers!