Update curl-rust to fix SSL on windows

Closes #873
auto merge of #878 : alexcrichton/cargo/update-curl, r=brson

Closes #873
Improve zsh completion

Add test name completion from Cargo.toml

Add package name completion from Cargo.toml

Rename --name to --<target-name>
auto merge of #881 : eerden/cargo/zsh-completion-improvements, r=alexcrichton

Some small improvements:

Add test name completion from Cargo.toml

Add package name completion from Cargo.toml

Rename `--name` to `--\<target-name\>`