When verify is false in the faraday adapter, turn off peer verification.

I was having an issue with faraday requests entering a black hole when using self-signed certs and typhoeus as the adapter. After having a poke inside I found the ssl_verifypeer request option wasn't being set to false when the verify ssl option was set to false. The default for this curl option is true. 

This PR changes the faraday adapter to turn off peer verification when verify is set to false.

[1] - http://curl.haxx.se/libcurl/c/curl_easy_setopt.html#CURLOPTSSLVERIFYPEER