Mootools-core 1.4.5 Request.JSON doesn't work with WCF for post method

[stkap]

Mootools-core 1.4.5 Request.JSON doesn't work with WCF for post method because of spoiled Content-Type attribute in lines:

if (this.options.urlEncoded && ['post', 'put'].contains(method)){
     var encoding = (this.options.encoding) ? '; charset=' + this.options.encoding : '';
     this.headers['Content-type'] = 'application/x-www-form-urlencoded' + encoding;
}

Such Content-Type is for web-form, but is not for json. For json it must be "application/json".

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