Added in support to allow mulitple values for a single query parameter

[pddivine]

This update allows for multiple values to be specified for a single query parameter, as in the following:

queryParams: {
      param0: [ 'value1' , 'value2', value3' ],
      param1: 'value4'
}

The resulting query string will be something like:

?param0=value1&param0=value2&param0=value3&param1=value4

This has been tested on an existing use case

[tb-campbell]

@kndt84 could you review this PR when you have a chance? I've run into a need for this functionality as well