Re-export all public api dependencies

[tylerhawkes]

A lot of the examples show that to use google-storage1 or any other google-* crate that you need to include the crate and the correct version of hyper and some other things in Cargo.toml. Would you consider doing something like

pub mod deps {
    pub use yup_oauth2;
}

so that consumers of the api could do

use google_storage1::deps::*;

and then we wouldn't have to exactly match hyper versions or have clients depend on crates that are part of the public api to be able to use them?

[Byron]

Work on the next version is currently underway, and we will absolutely consider improving on this, while we are at it.

Is this a blocking issue for you?

CC @ggriffiniii