fix issue #116

[Antman2023]

Is it easy way to fix #116?

[marcosnils]

@pathletboy haven't had the time look at it, but at a first glance tests are failing.

[Antman2023]

type *http.Client has no field or method Timeout in go1.2, go1.5.1 passed.

[sschepens]

@pathletboy this is not good, it adds yet another race condition to goreq. This is setting the default client's timeout. We have similar issues now, and i'm not happy about them.
If two requests were made concurrently then there is a chance that one would step over the previous value of timeout before the first request actually starts.

[marcosnils]

@sschepens we were already having race conditions with the previous timeout implementation. I've moved our strategy to golang default timeout method. This will be automatically resolved when / if we decide what to do with current race conditions.