added RequestData documentation (#226)
added RequestData documentation (#226)

added minimal http.RequestData information on README
tomchristie/apistar,rsalmaso/apistar,rsalmaso/apistar,tomchristie/apistar,tomchristie/apistar,encode/apistar,rsalmaso/apistar,encode/apistar,encode/apistar,rsalmaso/apistar,encode/apistar,tomchristie/apistar