Don't build the bors-ng staging.tmp branch on travis
Don't build the bors-ng staging.tmp branch on travis

steveklabnik/crates.io,rust-lang/crates.io,rust-lang/crates.io,steveklabnik/crates.io,steveklabnik/crates.io,rust-lang/crates.io,steveklabnik/crates.io,rust-lang/crates.io