rust-unwrap 1.2.1 unwrap! and unwrap_err! macros

This crate provides two macros, unwrap! and unwrap_err!. The former can be used to unwrap values of type Result or Option (or any type that implements VerboseUnwrap) and is comparable to calling unwrap(). The latter can be used to unwrap an error from a Result (or any type that implements VerboseUnwrapErr) and is comparable to calling unwrap_err().