Add configurable request timeout options

[gogochikago]

I would like to be able to adjust the timeout time so that it can be dynamically changed if there is a large delay or host latency.

@hakanensari, check please

[skatkov]

@gogochikago good proposal. not sure that I agree with proposed implementation through, but before giving my comments on that... I wanted to ask.

If I remember correctly, you can set default timeouts for excon for yourself without modifying this gem. Like this:

Excon.default[:connect_timeout] = 5
Excon.default[:read_timeout] = 60

Have you tried that? Is there any reason why that doesn't work for you?

[hakanensari]

To add to @skatkov's comment

Correct me if I'm wrong, but the defaults of Excon for both values seem to be 60 seconds. If so, overriding the default read_timeout would be redundant?