Support for empty query param values

[DavidRyan]

I think the issue is when the queryString.split happens it's not checking if the returned array is greater that 1

        ERROR https://mock.vokal.io/v1/user/?search=&page=1
        java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
            at io.vokal.mocktrofit.MockClient.alphabetizeQuery(MockClient.java:48)
            at io.vokal.mocktrofit.MockClient.alphabetizeEncodeQuery(MockClient.java:56)
            at io.vokal.mocktrofit.MockClient.getFileName(MockClient.java:112)
            at io.vokal.mocktrofit.MockClient.execute(MockClient.java:239)
            at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:326)
            at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
            at retrofit.RestAdapter$RestHandler$1.invoke(RestAdapter.java:265)
            at retrofit.RxSupport$2.run(RxSupport.java:55)
            at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
            at java.lang.Thread.run(Thread.java:818)

[wmbest2]

Good catch