The HTTPClient on Android is not dispatching the callback "onreadystatechange".
There appears to be a typo in TiHTTPClient.java with the callback
being named "onreadystatechanged" (notice the 'd' at the end).
Along with fixing this typo we should create a new Anvil test
case to catch future regressions in the HTTP callbacks. At least
verify each one fires at the correct time.