[feature] Support for multi value with same key on POST

[reki2000]

Expected usage:

Map<String,Object> params = new HashMap<String, Object>();
params.put("single", "value"); // of course, this works now
params.put("multi", new String[] { "value1", "value2" }) ; // this doesn't work - want to pass array or Iterable
Response response = HTTP.post("http://someurl", params);

If this interface looks good, I would make PR for this issue

[seratch]

I think it looks good.

[seratch]

version 0.5.4 is out. https://oss.sonatype.org/content/repositories/releases/com/m3/curly/0.5.4/