Because of the changes in the API it'll be hard to make this change, but it would be nice if the API told us what our refresh rate was and when the next refresh would be.

i.e. currently the refresh rate is 500 requests, the next refresh would be in 5 minutes (or whatever).

The only headers the API provides is how many requests I have left, not when the next refresh will be occurring.

```terminal
#<HTTParty::Response:0x7fa328b6c0b0
  parsed_response={}, 
  @response=#<Net::HTTPOK 200 OK readbody=true>,
  @headers={
    "server"=>["nginx"], "date"=>["Tue, 29 Oct 2013 23:07:51 GMT"],
    "content-type"=>["application/json; charset=utf-8"], "transfer-encoding"=>["chunked"],
    "connection"=>["close"], "vary"=>["Accept-Encoding"], "status"=>["200 OK"],
    "x-shopid"=>["1234"],
    "x-shopify-asset-version"=>["79e78afd331c86c4c25143a3f68c5fc71940c6e7"],
    "x-shopify-shop-api-call-limit"=>["9/500"],
    "http_x_shopify_shop_api_call_limit"=>["9/500"],
    "x-frame-options"=>["DENY"], "x-ua-compatible"=>["IE=Edge,chrome=1"],
    "set-cookie"=>["_secure_session_id=abracadabra; path=/; secure; HttpOnly"],
    "x-request-id"=>["32c697f0b3a65c2e8c43c0eb0088cafa"],
    "p3p"=>["CP=\"NOI DSP COR NID ADMa OPTa OUR NOR\""]}>
```