Add getters for time
Add getters for time

Adds bindings for the following options.
- CURLINFO_TOTAL_TIME
- CURLINFO_NAMELOOKUP_TIME
- CURLINFO_CONNECT_TIME
- CURLINFO_APPCONNECT_TIME
- CURLINFO_PRETRANSFER_TIME
- CURLINFO_STARTTRANSFER_TIME
- CURLINFO_REDIRECT_TIME

alexcrichton/curl-rust,alexcrichton/curl-rust,alexcrichton/curl-rust,carllerche/curl-rust