Use array only if parameter was sent multiple times

[fessmage]

In current state usage of multi_value_params true make all GET parameters declare as array.

I suggest in such case declare as array only that parameter, which was really sent in request multiple times.

[daichirata]

@fessmage Thank you for your suggestion about the improvement. I think that improvement is a good idea.

multi_value_param_names foo,bar

I'm trying to add a setting so that only the specified key is an array, what do you think?

[fessmage]

@daichirata that sounds great! It would solve my problem with processing of such web-requests through fluentd