Add Url::username() and Url::password() convenience accessors.
Add Url::username() and Url::password() convenience accessors.

jgillich/rust-url,nox/rust-url,cGuille/rust-url,pyfisch/rust-url,cGuille/rust-url,servo/rust-url,servo/rust-url,pyfisch/rust-url,nox/rust-url,jgillich/rust-url