Separate status codes by type and add helper methods to check status

[mwitek]

• Break status codes up by type
• Add status boolean helper methods to check status types.
  example usage:

HTTP.get('http://google.com').status.informational?
HTTP.get('http://google.com').status.success?
HTTP.get('http://google.com').status.redirect?
HTTP.get('http://google.com').status.client_error?
HTTP.get('http://google.com').status.server_error?

returns true or false, depending on status code type

[ook]

Nice, I like it 👍
PR seems valid to me.

[tarcieri]

Yeah, looks good to me too

[ixti]

Why not simply:

def informational?
  100 <= self && self < 200
end

def success?
  200 <= self && self < 300
end

# ...

[ixti]

Is there a real need in those constants?

[ixti]

There's even a warning line in the beginning of reasons file:
https://github.com/mwitek/http/blob/824b90b33aefcfbf8110106d1f5c29815280c3fe/lib/http/response/status/reasons.rb#L1

[ixti]

Just for the record, when you need to check if key is in hash or not it's better to use Hash#key? rather than creating new Array with Hash#keys and then calling #include? on that array. :D

[mwitek]

:doh:! Thanks for the tip :)