Make read_timeout configurable

[dougbarth]

Our chef integration to create data alerts sometimes fails because our API request to load all alerts times out. For now I'm monkey patching a higher timeout in Dogapi::APIService#connect, but it would be nice if I could tune the read_timeout when creating the Dogapi::Client.

[jonaf]

+1 -- not sure why a 5 second timeout was hardcoded in the first place. Timeout happens 100% of the time when I perform a search.

[emalm]

+1: We're seeing intermittent timeouts when batch updating alerts.

[emalm]

Great, thanks for the fast response!

[clofresh]

Should have fixed this a while ago. Gem release coming soon once work out why travis is failing