Reuse stdlib http response codes dictionary
Set arbitrarily higher json output float precision

Using 6 decimal places so geo-referenced points have an accuracy of 0.111m.
Case-insensitive request headers dictionary
WSGI headers normalization
Merge branch 'headers-dict' into develop

* headers-dict:
  WSGI headers normalization
  Case-insensitive request headers dictionary
  Set arbitrarily higher json output float precision
  Reuse stdlib http response codes dictionary
Merge branch 'response-exception' into develop

* response-exception:
  Replace FourOhFourException usage with ResponseException
  ResponseException definition and handling
  Set arbitrarily higher json output float precision
  Reuse stdlib http response codes dictionary