Progress not working on local html files loaded with loadRequest:

[imanzarrabian]

Hey,
It seems to me that only http and https schemes are currently supported and this makes urls starting with file:// not work with the progress mechanism. Am I correct or missing something?
This could be useful for local HTML strings for example. Using a file instead of loadHTMLString:
Anyway I added this line of code and a pull request ready if needed ;)

BOOL isHTTPOrLocalFile = [request.URL.scheme isEqualToString:@"http"] || [request.URL.scheme isEqualToString:@"https"] || [request.URL.scheme isEqualToString:@"file"];

[axl411]

@ninjinkun hi 人参君, could you please add a new release including this PR? Currently the newest release is "on May 7, 2014"