function serializeHeaders(mHeaders) {
		var sHeaderName,
			aHeaders = [];

		for (sHeaderName in mHeaders) {
			aHeaders.push(sHeaderName, ":", mHeaders[sHeaderName], "\r\n");
		}

		return aHeaders;
	}
Serializes a map of request headers to be used in a $batch request.

@param {object} mHeaders
  A map of request headers
@returns {object[]} Array representing the serialized headers